Example: Jim's loan application and his credit score
Jim is a self-employed carpenter, who accepts cash-in-hand payments from his customers. He keeps detailed records of all his payments and pays his tax to HMRC in a timely manner.
Despite being well paid and never out of work, Jim found it more difficult to be approved for a mortgage due to being self-employed and being paid cash-in-hand.
Still, after showing his chosen mortgage lender 6 months' worth of bank statements as well as his annual tax statements, he was able to be approved for a mortgage.
* This is a fictional, but realistic, example.