Trust me, there is legal work involved. This is to transfer between a FA Offset to FA tracker or vice versa. No legal work to transfer from FA standard variable to FA tracker or fixed. Only with Offset. Whether you use their First American Service or your own solicitor there is definetly legal work involved even though it is same bank, there are differences in the legalities of the mortgage so at the moment (may change) it is not as simple as switching from one to another, you are actually applying for a new mortgage and clearing the offset mortgage.