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You get credit reports for free from all three UK agencies (it used to be £2 under the DPA, but is free under GDPR).
This shows all the data that has been collected from your financial history, and is the basis of any credit decisions (and address validation, among other checks).
Anything else is something different - a score, for example. These offer interpretation of the data available, and are entirely proprietary to the agency, and may not reflect what a bank, for example, might consider as a reflection of a) your credit worthiness, or b) your value as a fee paying customer.
What's the go to place for getting a credit report these days? I think I signed up for a free one years ago and then killed it before they billed me. It wasn't Equifax think it was Experian. Anyone better? Free without spammyness?