What Is a Credit Score? A UK Guide

Credit score in plain English

A credit score is a number lenders use to estimate how risky it is to lend you money. It is based on your credit file — a record of how you have borrowed and repaid in the past.

In the UK there is no single official credit score. Experian, Equifax and TransUnion each hold a file on you and may show a different score depending on their own scale.

Who holds your credit file

The three main UK credit reference agencies (CRAs) are Experian, Equifax and TransUnion. Banks, credit card companies, mobile networks and some utilities report payment behaviour to them.

Lenders check your file when you apply for credit — loans, mortgages, credit cards, car finance, phone contracts and sometimes rental references.

What lenders actually look at

Lenders rarely rely on a score alone. They review your full credit file: missed payments, defaults, county court judgments (CCJs), how much you already owe, recent applications and whether you are on the electoral roll.

Each lender sets its own rules. You can be accepted by one bank and declined by another with the same score.

Why your score differs between apps

ClearScore shows Equifax data. Credit Karma uses TransUnion. Experian has its own app. MSE Credit Club also uses TransUnion. Scores on a 0–999 scale, 0–700 scale or letter grades are not directly comparable.

Focus on what is on your file — late payments, high balances, errors — rather than chasing one magic number.

Credit score vs credit report

Your credit report is the detailed history. Your credit score is a summary indicator derived from that report. Fixing report problems (wrong addresses, duplicate accounts, incorrect defaults) improves scores over time.

Who can see your credit file

Only organisations with a legitimate reason — usually when you apply for credit or an account that involves payment over time. Checking your own file is a soft search and does not harm your score.

Employers do not receive your credit score routinely, though some financial-sector roles may require credit checks with your consent.

Does checking your score lower it?

No. Checking your own score or report through a free service is a soft search. Hard searches happen when you apply for credit and a lender runs a full check — too many in a short period can look risky.

Why it matters in everyday life

A stronger credit history can mean lower APR on loans and credit cards, higher credit limits, better mortgage options and smoother phone or rental applications. A weak file does not always mean no credit — but it often means more expensive borrowing.

What to do next

Check all three agencies if you can — files can differ. Read our guide on checking your score for free, then use our loan and affordability calculators to see what repayments might look like before you apply.