You can request your credit report from one of the credit agencies. Experian, Equifax and TransUnion. If you are preparing to apply for a mortgage, request all 3 as you don’t know which agency the lender will use.
Experian offers free access to your credit score [1], or a paid for subscription to your credit report [2] with a one-month free trial. You can also request a free basic statutory report of your credit history.
Equifax via ClearScore [3] offers free access to your credit score and report. You can also subscribe to the Equifax credit score and report [4] again free for the first 30 days.
TransUnion is less widely used by lenders. You can get free access to your credit score and report via Credit Karma [5].