Your name’s correct, including any maiden names or other names you’re known by

Your address details are correct, and that if you’re on the electoral roll, your credit report also shows this

That your payment record’s correct (though there can be delays in reporting, so your current balance is unlikely to be your actual current balance; it’ll be what it was the last time that lender reported to TransUnion)

That any financial links on your credit report are current; you can remove old links if an account’s paid off and closed

That any public information (CCJs, decrees, IVAs and bankruptcies) are correctly recorded