Does anyone know if when you transfer money from an account in England to an account abroad and vice versa if you lose a certain percentage to the bank for transferring it and for transferring the currency?
The bank may charge you to transfer the money if the bank the money is going to is not part of the same banking group. There will be commission charges on currency exchanges but you can have money transfered in Sterling and then make other arrangements to exchange it (although the bank rate will be more favorable as they will use currency trading valuations not tourist rates when deciding what your currency is worth).
in the UK usually expect to pay a fee linked to the amount sent(usually a max and min fee too) - the rate you get on the currency exchange should be a little better than if you buy notes/cash