You check one app and see 721. You check another and see 942. A third says "Fair". None of them are wrong, and none of them are the number a lender will use.
This is one of the most common sources of confusion in personal finance, and it gets in the way of doing the things that actually help.
There is no such thing as your credit score
The UK has three main credit reference agencies: Experian, Equifax and TransUnion. Each holds a file on you, and each has its own scoring model with its own scale. Experian runs to 999, Equifax to 1,000, TransUnion to 710. The numbers are not comparable, and converting between them is meaningless.
More importantly, lenders do not use these scores. A lender pulls your report — the underlying data — and runs it through its own model, weighted for its own risk appetite and the product you are applying for. The score you see is the agency's interpretation of your file, offered to you as a rough indicator. It is not the thing being assessed.
The files also differ. Not every lender reports to all three agencies. An account visible on one report may be absent from another, which alone can explain a gap between two numbers.
What lenders actually look at
Broadly, in rough order of weight:
Payment history. Whether you have paid on time, month after month. This is the largest single factor, and the slowest to change — which is why there are no legitimate shortcuts.
Credit utilisation. How much of your available revolving credit you are using. A £2,000 limit with £1,800 outstanding reads very differently from the same balance against a £10,000 limit.
Age and depth of file. A long, boring record of accounts managed well is worth more than a short one, however clean.
Recent applications. Several hard searches in a short period suggests someone actively seeking credit, which lenders read as a risk signal.
Public record entries. Defaults, county court judgments, bankruptcies and individual voluntary arrangements. A default stays for six years from the date of default, whether or not the balance is later cleared.
Notably absent: your income, your savings, your employer, and whether you are in your overdraft. Those may matter to an individual lender's affordability check, but they are not on your credit file.
The utilisation trap
Utilisation is reported to the agencies once a month, typically on your statement date — not on the date you pay.
So someone who spends £900 on a £1,000-limit card and clears it in full every month, never paying a penny in interest, can still show 90% utilisation on their file. They are behaving impeccably and reporting badly.
Two ways out: pay down the balance before the statement date rather than after, or request a limit increase so the same spending is a smaller proportion. Both are ordinary and unglamorous. Both work.
Things that do not do what people think
Checking your own report. A soft search. Visible only to you. Check it as often as you like.
Closing old accounts. Often counterproductive — it reduces your total available credit, which pushes utilisation up, and eventually shortens your file.
"Credit repair" that promises to remove accurate entries. Accurate information cannot be removed on request. Inaccurate information can and should be challenged, and it is worth checking for — but that is a correction, not a repair service.
Being on an electoral roll. This one is real, and cheap. It helps lenders verify your address. Register.
A realistic timeline
Nobody can promise you a specific score by a specific date. What is reasonably predictable is the shape of it: errors corrected show up within a few weeks; utilisation changes show up on the next statement cycle; payment history builds over months; a default's effect fades gradually and drops off entirely at six years.
If you are preparing for a mortgage application, this is the argument for starting well before you need to — not because anything dramatic happens quickly, but because the useful changes are cumulative.
Where we come in
We help people read their own reports across all three agencies, identify what is genuinely holding them back, challenge anything inaccurate, and put a realistic month-by-month routine in place.
What we will not do is promise a number. Lenders set their own criteria, and anyone guaranteeing a score increase is selling something they cannot deliver.