FPP
Talking Radalt, or any of us, doesn't need to change bank details on JPA. The RAF will continue(?) crediting our existing accounts, but we simply ask the bank to open up another similar current account into which we transfer the monthly pay. Our existing JPA declared account will be the buffer. All automatic transactions can be set up in the new account.
Having said all that, I'm not convinced that we are vulnerable to hacking to the extent that our accounts might suffer unauthorised debits. JPA will never know my banking passwords.