Marketing & Data Glossary
Plain-English definitions of the terms you'll encounter in direct marketing, data strategy, email campaigns and fulfilment — from CPL and co-registration to UK GDPR and suppression lists.
First-party, opted-in consumer data is a brand's most durable asset. But realising its value depends on understanding the language of the industry — from how leads are priced, to how data must be handled under UK law, to what makes an email campaign perform.
This glossary covers the terms LMG uses with clients every day. Use the section headings below to jump straight to the area you need, or read through for a grounding in results-driven, data-led marketing.
Lead Generation
The language of acquiring new prospects — how leads are defined, priced, sourced and measured.
Lead Generation
The process of attracting consumers who have expressed a genuine interest in a product or service and capturing their contact details so a brand can market to them directly. Unlike advertising that pays for impressions or clicks, lead generation delivers a named, contactable individual — a prospect who has actively raised their hand.
Cost Per Lead (CPL)
A performance pricing model in which an advertiser pays a fixed fee for each qualified consumer record delivered, rather than paying for impressions or clicks. CPL removes budget risk: you know exactly what each new prospect costs before the campaign launches. LMG operates on a fixed CPL basis — you agree the price and volume in advance, and we deliver to that specification.
Cost Per Click (CPC)
A digital advertising pricing model in which an advertiser pays each time a user clicks on an ad. CPC campaigns drive traffic but offer no guarantee of genuine interest — a click does not mean a sale or even a meaningful engagement. Many brands combine CPC for awareness with CPL for prospect acquisition, since CPL produces qualified records rather than anonymous visitors.
Co-registration
A lead generation method in which a consumer opts in to receive information from a brand at the moment they register with a relevant partner website. Because the opt-in occurs within an existing registration flow, friction is low and intent is high — the consumer has just demonstrated interest in a closely related topic. Co-registration leads tend to be cost-effective with strong initial engagement.
Opt-in
An explicit action taken by a consumer to give their consent to receive marketing communications. A valid opt-in requires that consent is freely given, specific, informed and unambiguous — it cannot be pre-ticked or bundled with terms and conditions. All consumers in LMG's 4.5 million-strong database have opted in to receive relevant marketing.
Unincentivised Opt-in
Consent given by a consumer without any reward, prize draw or incentive attached. Unincentivised opt-ins are widely regarded as the gold standard in direct marketing because the consumer's interest is genuine rather than prize-motivated — they are more likely to engage with subsequent communications and convert. LMG's Catalink database is built on unincentivised consent from consumers actively requesting brochures and catalogues.
Lead Nurturing
The practice of building a relationship with a new lead through a structured sequence of relevant communications — typically email, print or a combination — until the prospect is ready to buy. A lead rarely converts on first contact; nurturing keeps your brand in front of the consumer during the consideration phase and progressively qualifies intent, dramatically improving conversion rates.
Conversion Rate
The percentage of leads or contacts who complete a desired action — making a purchase, requesting a brochure, booking a call. Conversion rate is one of the most important performance metrics in direct marketing: a modest improvement in conversion can have a large impact on customer acquisition cost and overall return on investment. Nurturing programmes are specifically designed to lift conversion rates from a cold lead pool.
Customer Acquisition Cost (CAC)
The total cost of winning a single new paying customer, including all marketing and sales expenditure. With CPL marketing, CAC is straightforward to calculate: divide the cost of leads (CPL × volume) by the number of customers acquired. Brands that own their own first-party data and nurture it effectively consistently achieve a lower CAC than those relying on paid advertising alone.
Consumer Profiling
The process of enriching consumer records with demographic, behavioural and interest-based attributes so that campaigns can be targeted precisely. LMG uses its proprietary nGage profiling platform to segment its 4.5 million consumer database by age, gender, affluence, geo-location, spending history and declared interests — ensuring every lead delivered is a genuinely relevant prospect for the client's product.
Segmentation
Dividing a database into distinct groups based on shared characteristics — age, geography, purchase history, interests — so that each group receives the most relevant message. Proper segmentation consistently improves response rates and reduces unsubscribes because recipients receive content that is genuinely applicable to them. It is the foundation of personalised, results-driven marketing.
First-Party Data
Data collected directly by a brand from its own customers and prospects — purchase history, website behaviour, email engagement, survey responses. First-party data is the most valuable type because the brand owns it outright, the consent relationship is direct, and it is unaffected by third-party cookie deprecation or platform algorithm changes. Building a first-party database through lead generation is one of the highest-ROI marketing investments a brand can make.
Data & Compliance
The regulatory and technical concepts every marketer using consumer data needs to understand.
Third-Party Data
Consumer information collected by an organisation other than the brand using it — typically a data broker or list provider. Unlike first-party data, the brand has no direct consent relationship with the individuals concerned. Third-party data is useful for prospecting, but quality and compliance must be verified rigorously. It does not compound in value the way first-party data does, because the brand does not own the ongoing relationship.
UK GDPR
The UK General Data Protection Regulation — the post-Brexit domestic version of the EU GDPR, supplemented by the Data Protection Act 2018 — sets the legal framework for collecting, storing and using personal data in the United Kingdom. Key principles include lawfulness, fairness and transparency; data minimisation; accuracy; storage limitation; and accountability. For direct marketing, the lawful basis is typically consent or legitimate interests, and individuals retain the right to object or unsubscribe at any time.
Data Cleansing
The process of identifying and correcting (or removing) inaccurate, duplicate, incomplete or outdated records from a database. Regular cleansing keeps delivery rates high, reduces wasted postage and email sending costs, and ensures compliance with data accuracy obligations under UK GDPR. Common tasks include de-duplication, format standardisation, address validation (PAF checking) and deceased/gone-away suppression.
Suppression
The practice of excluding specific records from a mailing or email send — typically individuals who have unsubscribed, opted out, complained, or are on a statutory preference service such as the Telephone Preference Service (TPS) or Mail Preference Service (MPS). Running suppression before every campaign is both a legal obligation and a deliverability best practice: mailing or emailing opted-out contacts damages sender reputation and risks regulatory action.
Data Appending
Enhancing an existing customer database by matching records against a reference dataset to add missing fields — for example, adding email addresses to a postal-only file, or appending demographic attributes such as age band or affluence score. Appending allows brands to activate channels they could not previously reach and to improve targeting precision without acquiring entirely new leads.
Churn
The rate at which customers or subscribers leave a database or cancel a service over a given period. High churn erodes the value of a hard-won database and increases customer acquisition costs because new leads must constantly replace those lost. Reducing churn through consistent, relevant communications — lead nurturing, loyalty programmes and re-engagement campaigns — is typically far more cost-effective than continuous new acquisition.
Legitimate Interests
One of the six lawful bases for processing personal data under UK GDPR. A business may process data without explicit consent if it has a genuine, proportionate interest in doing so and that interest is not overridden by the rights and expectations of the individuals concerned. For direct marketing, legitimate interests is commonly used for B2B postal and email, but must always be balanced against the individual's right to object.
Preference Service (MPS / TPS)
Statutory opt-out registers operated in the UK that allow individuals to record their preference not to receive unsolicited direct mail (Mail Preference Service) or telephone marketing (Telephone Preference Service). Marketers are legally required to screen outbound campaigns against the relevant preference services before contacting consumers. Failure to do so can result in fines from the Information Commissioner's Office (ICO).
Email Marketing
The metrics and concepts that determine whether your email campaigns land in inboxes and drive responses.
Email Deliverability
The ability of an email to reach a recipient's inbox rather than being filtered into spam or rejected outright. Deliverability depends on sender reputation, authentication records (SPF, DKIM, DMARC), list hygiene, engagement history and content quality. High deliverability is the prerequisite for every other email metric — an email that does not arrive cannot be opened, clicked or converted. LMG guarantees inbox delivery for all campaigns it sends on behalf of clients.
Open Rate
The percentage of delivered emails that are opened by recipients. Open rate is an indicator of subject-line effectiveness, sender reputation and list relevance — but it should be read alongside click-through rate and conversion rate for a complete performance picture. Apple Mail Privacy Protection (introduced in 2021) inflates open rates for iOS users, so many marketers now weight click and conversion metrics more heavily than opens alone.
Click-Through Rate (CTR)
The percentage of email recipients who click at least one link within a message. CTR is a stronger intent signal than open rate because it requires an active decision to engage with content. Low CTR on a healthy open rate suggests the email body, calls-to-action or offer are not compelling; low open rate with low CTR suggests a subject line or sender-name problem.
Sender Reputation
A score assigned by internet service providers (ISPs) and email platforms to a sending domain or IP address based on factors such as bounce rate, spam complaint rate, unsubscribe rate and engagement history. A strong sender reputation means emails are more likely to reach the inbox; a damaged reputation can result in bulk filtering or outright blocking across major email providers. Maintaining a clean, engaged list and honouring unsubscribes promptly are the most important levers.
Bounce Rate (Email)
The percentage of emails that could not be delivered. Hard bounces are permanent failures — the address does not exist — and should be removed from the database immediately. Soft bounces are temporary failures, such as a full mailbox, and can be retried. High bounce rates indicate a stale or poorly maintained list and damage sender reputation if left unaddressed.
Re-engagement Campaign
A targeted campaign sent to subscribers who have not opened or clicked for a defined period — typically 90 to 180 days — with the aim of rekindling their interest or confirming they still wish to receive communications. Effective re-engagement campaigns reduce list decay, protect sender reputation and often surface valuable segments who simply needed a more relevant prompt. Those who remain unresponsive are then suppressed to protect deliverability.
Double Opt-in
A two-step confirmation process in which a consumer first submits their email address and then confirms it by clicking a link in a verification email. Double opt-in produces smaller lists than single opt-in but delivers higher engagement, lower bounce rates and a more defensible consent record. It is considered best practice for building a long-term email marketing asset.
List Hygiene
The ongoing maintenance of an email database to keep it accurate and engaged — removing hard bounces, processing unsubscribes, suppressing spam complainants and periodically re-engaging or removing inactive addresses. Good list hygiene is the single most effective way to protect deliverability and open rates. A smaller, clean, engaged list almost always outperforms a larger, stale one.
Fulfilment
The language of physical fulfilment — from picking and packing to postal partnerships and quality standards.
Fulfilment
The end-to-end process of receiving, picking, packing and dispatching physical items — brochures, catalogues, samples, merchandise — in response to a consumer request or order. In a direct marketing context, fulfilment is the crucial link between a lead or enquiry and the physical communication that moves a prospect towards purchase. Poor fulfilment speed or quality can undo the investment made in acquiring the lead in the first place.
Royal Mail Partner in Quality
An accreditation awarded by Royal Mail to fulfilment operations that consistently meet its standards for mailing preparation, sortation and data quality. Partner in Quality status typically enables access to preferential postage rates, priority processing and direct integration with Royal Mail's downstream access network. LMG holds Royal Mail Partner in Quality accreditation — a tangible assurance of consistent, compliant mailing production.
Brochure & Catalogue Fulfilment
The specialist service of receiving consumer requests for printed materials — whether generated by a lead campaign, a press advertisement or a website enquiry — and dispatching them promptly. Speed matters: research consistently shows that consumer interest peaks in the first 48 hours after a request. LMG processes requests and dispatches materials typically within 24 hours of receipt.
Print Management
The procurement, specification and quality management of printed materials — brochures, leaflets, catalogues, direct mail packs — on behalf of a client. A professional print manager leverages buying power, production expertise and supplier relationships to deliver print at a lower cost and higher quality than most in-house teams can achieve. LMG's print management service covers briefing, origination, proofing, production and delivery to the fulfilment warehouse.
Digital Fulfilment
The electronic delivery of requested materials — PDFs, e-brochures, discount codes, confirmation emails — as either a complement to or a replacement for physical despatch. Digital fulfilment is instant, zero-postage and measurable: open tracking shows which recipients engaged with the content. LMG offers digital fulfilment alongside physical options, allowing clients to reduce cost whilst maintaining the immediacy that drives conversion.
PAF (Postcode Address File)
Royal Mail's authoritative database of every valid UK postal address — approximately 30 million addresses. Validating consumer records against PAF before a mailing ensures letters are addressed correctly, reduces undeliverables and qualifies brands for presort postal discounts. PAF checking is a standard step in LMG's data-processing workflow and is required for Royal Mail Advertising Mail and Partially Addressed Mail products.
Our Services
Now you know the terminology — explore the LMG services that put these principles to work for your brand.
Lead Generation
Fixed CPL campaigns delivering guaranteed volumes of opted-in UK consumers matched to your precise demographic profile.
Lead GenerationEmail Marketing
Guaranteed inbox delivery to our 4.5 million opted-in members or your own list — with full design, coding and hosting included.
Email MarketingConsumer Data
Explore our 4.5 million consumer database — profiling, segmentation and targeting options for campaigns of every size.
Consumer DataLead Nurturing
Automated multi-touch programmes that move leads through the buying cycle and dramatically improve conversion rates.
Lead NurturingFulfilment Services
Royal Mail Partner in Quality fulfilment — brochures, catalogues and samples despatched typically within 24 hours of request.
Fulfilment ServicesCommon Questions
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