If you are employed, you should supply your last P60 and three months’ pay slips and bank statements into which your salary is paid. The statements should have your name and address on.
If you are self-employed and a sole trader, your last two years’ tax calculations and overviews will be needed. If you are a director of your own limited company, you will potentially need to provide your last three years’ full trading accounts as well as tax calculations and overviews. A lender will also need your last three months’ business bank statements and may go back further.
If you are remortgaging, your most recent mortgage statement and account number.
If you are buying, proof of deposit and/or details of any sum being gifted to you.