In reply to mockerkin:
Never had any problems and always excellent over the four years or so I have had an account. Once they "stopped" a CAF cheque being cashed and referred back to me first when an attempt was made to cash by a different payee to that on the cheque.
4% is the charge of all monies added to my CAF account (unless over about £19000 or so per yr!) - part goes to CAF as a fee, part to CAF as a contribution and part to the NVCO as a contribution. Always do it anon to stop charities writing once they have your details.
Further info can be search from
https://www.cafonline.org/default.aspx