Here's a made-up reader called Alex. Alex took a free copy of your trade title after filling in a form at a show. A year later, their employer bought them a paid supplement. Alex signed up for the newsletter with a personal email address, then changed jobs and registered again from the new company.
That's one person and four records. Nobody did anything wrong. Every one of those entries was keyed correctly, by someone doing their job.
A single customer view just means all of that sits on one record, so anyone in the business can see who Alex is and what they have with you. It sounds like tidying up. In practice it touches your audit, your data protection duties and, from January, your subscription reminders.
How one person becomes four
Duplicates rarely come from carelessness. They come from the joins between systems and teams.
- Different routes in. Web forms, event lists, phone orders, agency orders and imports each create a record, and few of them check for an existing one.
- Work and personal email. If email is your main matching key, the same person with two addresses looks like two people.
- Job moves. In B2B this is the big one. A new employer means a new email and a new address, so the match fails.
- Reader and payer. The person who reads the title and the person in accounts who pays for it are often different, and they get muddled.
- Separate lists. The newsletter platform, the events system and the circulation file all hold their own version of the same person.
What the audit rules say
If you're ABC audited, this isn't just housekeeping. ABC's Business Magazines standards say you can't claim duplicate copies to a known individual unless there's a category for them, such as Multiple Subscriptions.
ABC's definition is broader than many people assume. A duplicate is two or more occurrences of the same name, or company name where no individual is identified, or address, "unless it can be shown" the copies go to different people. So two records for Alex is a problem, and so is an address with several copies if you can't show who they're for.
Addressing by job title doesn't get you out of it. ABC's controlled free guidance gives the example of 30 copies to "Company Secretary" at 30 branches of one firm. Those count as duplicates, because a company has only one. "Branch Manager" at each branch is fine.
There's a newer reason to link records too. Since the 2025 changes, you may claim a print and a digital copy to the same person, but you must report the average number of individuals who received both, per issue. If Alex's print copy is on one record and digital on another, you can't produce that number.
If AAM (formerly BPA) audits you, the principle holds but the sum differs. AAM reports those subscribers only once in total qualified circulation. Either way, you need to know they're the same person.
Data protection: four chances to get it wrong
UK GDPR says personal data should be accurate and, where necessary, kept up to date. Three records for Alex that still show the old job don't help you there. The ICO's accuracy guidance is the one to read.
The sharper risk is marketing. Under the ICO's right to object guidance, the right to object to direct marketing is absolute, and suppressing someone's details is usually better than erasing them. If Alex opts out on one record, the other three will carry on emailing them. That's an awkward thing to explain.
Subject access requests get harder as well. You must make a reasonable and proportionate search and normally reply within a month. Finding everything is much easier if it's in one place.
Reminders from January
The new consumer subscription rules are due to apply to contracts entered into from 1 January 2027, though the regulations still need Parliament's approval. If reminders become compulsory and one goes to an old email address on a forgotten record, you may have a missed reminder rather than just a missed renewal. Our guide to the subscription rules covers what's required.
There's a B2B wrinkle too. The same person can hold a company-paid subscription, which is out of scope, and a personal one, which may be in. So record who pays for each subscription, not just who the person is.
Getting to one record
You don't need a huge project. You do need some decisions before anyone starts merging.
- Name the master. Pick one system as the home of the person. Everything else feeds it or reads from it.
- Decide what makes a match. An exact email is strong. Name plus postcode, or name plus company, is good. Name alone isn't. Two people called John Smith can work at one firm, and a shared accounts@ address isn't a person.
- Keep the risky ones for a human. Automate the certain matches. Have someone review the rest.
- Write down what survives a merge. Which address wins? Which job title? Don't leave it to whichever record was kept.
- Keep every request date and source. Merging shouldn't change when a reader asked for the title, and it shouldn't reset the clock on ABC's five-year limit or AAM's 36 months.
- Be careful with consent. Bring the dated history across. An opt-out shouldn't vanish because the other record was kept.
- Keep a merge log. You'll want to show what became what, and undo a wrong one.
A job move needs its own rule. It's the same person, but their old qualification answers may no longer apply, so ask them again before you claim them at the new company. Keep people and companies as separate things in your system, and this gets much simpler.
Then stop new ones arriving
Merging is the easy half. Without changes at the door, the file fills back up.
Search before adding, on the phone and in the office. Make your web forms check for an existing email address. Match every event list and import against the file before it goes in, not after. And run a duplicate check before each issue goes to the mailing house, so it's a routine rather than a rescue.
Where we fit in
In Avio, our subscription platform for larger publishers, people and addresses are separate records, and contacts can be compared side by side and merged with a full merge history. In Adeptis, our all-in-one platform for smaller publishers, readers, advertisers and prospects share one CRM, and the de-dupe tools let you review each group before merging.
If you'd rather not do it yourself, our team can do a one-off data clean, and you don't need to be a software or bureau client.
If your file has more Alexes than you'd like, get in touch.
Rob Sherwood is Managing Director of Adept Data Services. He has spent his career in subscriptions and circulation, at WDIS, Optima and CDS Global before founding Adept.