Will this cause a difficulty for bank 3 or bank 4? ie that they approved me for a mortgage expecting me to be with x bank but then it turns out Im actually currently with y bank?Your solicitor will be requesting a redemption letter from your current lender. So now that you are with Bank 1 and moving to Bank 2, Bank 1 will provide it. When you are leaving Bank 2 for Bank 3, the letter will come from Bank 2.