The Hidden Data Behind Your Mortgage Application

You checked Experian. Your credit is good. Your income stacks up. The deposit is there. So why has the lender said no?

There is a common assumption that a mortgage application is essentially a calculation: income, deposit, property value and credit score go in; lending decision comes out.

It isn't.

Behind a modern mortgage application sits an increasingly sophisticated network of data. Some of it you will recognise. Some of it you probably won't. And, as I discovered personally, information held outside your normal credit file can become remarkably important when something goes wrong.

I have worked in mortgage and financial services for years and have run Lockhart Murphy since 2021. I have also had a National Hunter marker recorded against my own name.

So this isn't an entirely theoretical subject for me.

Your credit report doesn't tell the whole story

When somebody receives an unexpected mortgage decline, one of the first things they tend to do is check their credit report.

Often it looks fine.

That's because lenders aren't simply looking at the score you see when you log into a credit-checking app.

They may be considering information from credit reference agencies, their own customer records, previous applications, identity checks, bank statements and fraud-prevention systems. Open Banking and automated data analysis are adding further information to that picture.

One of those systems is National Hunter.

Most people have never heard of it until they have a reason to.

What is National Hunter?

National Hunter is a fraud-prevention system used by banks and other financial institutions.

In simple terms, it allows participating organisations to submit and compare application information to help identify inconsistencies and potential fraud.

Imagine applying for financial products at different times.

On one application your salary is £50,000. Somewhere else it is £70,000.

One application says you have lived at an address for four years. Another piece of information suggests three.

Your job title changes. Your employer changes. The source of a deposit is described differently. Information on a new application doesn't correspond with information provided previously.

There may be a perfectly legitimate explanation for any of those things.

People get promoted. Salaries change. Companies restructure. People move home. Circumstances change. Applicants make mistakes. Brokers make mistakes.

A discrepancy is not the same thing as fraud.

But fraud-prevention systems exist precisely because discrepancies can sometimes be significant.

And that's where things get interesting.

A computer can spot a difference. It can't always explain it.

This is the part of modern lending that deserves more attention.

Financial institutions process enormous volumes of applications. They cannot investigate every piece of information manually from first principles.

Technology is exceptionally good at finding patterns.

The difficult part is context.

There is a fundamental difference between information being inconsistent because somebody has deliberately misrepresented their circumstances and information being inconsistent because something changed, was misunderstood or was simply recorded incorrectly.

On a spreadsheet, however, both can initially look like a mismatch.

I understand the lender's side of this. Fraud costs the financial industry — and ultimately consumers — enormous amounts of money. Banks need sophisticated systems capable of identifying suspicious applications.

But I also understand the other side because I have experienced it myself.

Having a National Hunter marker against my own name gave me a very different appreciation of what happens when you are the person trying to understand the information sitting behind the system.

Suddenly the question isn't:

"Why did the lender decline me?"

It becomes:

"What information are they actually looking at?"

That can be a much harder question to answer.

National Hunter isn't CIFAS

The two names are frequently confused.

CIFAS and National Hunter both operate within the UK's fraud-prevention landscape, but they are different systems.

They also shouldn't be confused with your conventional credit report.

This matters because someone can look at their credit report, see nothing particularly alarming and reasonably conclude that there isn't a problem.

That conclusion can be wrong.

It is equally important not to jump to the opposite conclusion. A mortgage decline does not mean you have a National Hunter or CIFAS issue.

Mortgages are declined every day because of affordability, lending policy, property concerns, credit history, income structure and dozens of other reasons.

Sometimes a decline is simply a decline.

The difficulty is knowing when it isn't.

Banks have memories

There is another source of information borrowers often overlook: the lender itself.

If you have banked with an institution for years, borrowed from it previously or submitted previous applications, there may already be information about you within its systems, subject to the relevant data protection and retention requirements.

This creates an interesting feature of modern lending.

A mortgage application isn't necessarily a blank sheet of paper.

What you tell a lender today can exist alongside information supplied yesterday.

Normally that's completely unremarkable.

Until the two don't match.

Bank statements aren't just pieces of paper anymore

The same transformation is happening with bank statements.

For years, mortgage underwriting involved somebody looking through statements to understand salary credits, expenditure and financial commitments.

Increasingly, financial data can be analysed electronically.

Open Banking has accelerated that shift. Used appropriately, it can make mortgage applications quicker and give lenders a much clearer picture of someone's actual finances.

It also illustrates where lending is heading.

We're moving from an industry that reads documents towards one that interrogates data.

That's probably a good thing.

But the more decisions depend upon data, the more important the accuracy of that data becomes.

So what happens if the data is wrong?

Don't panic. And don't immediately fire applications at another five banks.

Find out what has happened.

Depending on the circumstances, you may be able to obtain information held about you, review previous application information, identify inaccuracies and ask for incorrect personal data to be corrected.

If an organisation has made a decision based on information you believe is wrong, there may also be an appropriate complaints process.

None of that means legitimate fraud-prevention information can simply be removed because it is inconvenient.

Nor should it.

There is a clear difference between challenging information because it is inaccurate and trying to circumvent a legitimate fraud-prevention measure.

But consumers should not be frightened of asking questions about information held about them.

If something is wrong, challenge it properly.

Why this matters for mortgages

One of the worst things you can do after an unexplained mortgage problem is assume that the solution must be another lender.

Sometimes it is.

Sometimes it isn't.

If the underlying issue follows you, another application may simply produce another problem.

This is particularly important where somebody has good income, reasonable credit and an otherwise plausible mortgage case but keeps encountering outcomes that don't seem to make sense.

That doesn't prove there is hidden adverse information.

It does mean it may be worth investigating before doing anything else.

After years of arranging mortgages — and having personally experienced the National Hunter system — this is something I feel particularly strongly about.

Mortgage broking isn't always about finding the cheapest rate on a sourcing system.

Sometimes the valuable part of the job is working out why nobody wants to lend in the first place.

When something doesn't add up

At Lockhart Murphy, we can help clients investigate unusual mortgage declines and situations where they believe inaccurate information may be affecting their ability to obtain finance.

That can mean reviewing the history of the case, looking for inconsistencies between applications and supporting information, establishing what information can be requested and helping clients understand the appropriate route for challenging factual inaccuracies.

Where appropriate, we can also help clients navigate complaints and consider when — and how — it makes sense to approach the mortgage market again.

We can't promise to overturn a lender's decision.

We can't remove legitimately recorded fraud-prevention information.

And we certainly can't make genuine problems disappear.

What we can do is look at the evidence, understand what has happened and help work out the next move.

Because if you've been declined for a mortgage and everything appears to stack up, there is a question worth asking before you submit another application:

What does the lender know that you don't?

Lockhart Murphy is a mortgage and protection adviser. Mortgage applications are subject to lender criteria, affordability, valuation and underwriting. Your home may be repossessed if you do not keep up repayments on your mortgage.