Do you mean NFA? If so, FXCM Uk doesn't have anything to do with them. FXCM.com is NFA regulated. Perhaps there's a UK regulator for account managers.
Anyway, let me make this perfectly clear from both the manager and clients point of view.
DO NOT LET ANYONE MANAGE YOUR ACCOUNT WITHOUT A SIGNED LPOA
DO NOT MANAGE ANYONE'S ACCOUNT WITHOUT A SIGNED LPOA
Without an LPOA, the broker can lock down the account and possibly even confiscate ALL the profits. The broker also could to check to see if the account manager has been accessing other accounts and do the same to those.
Without an LPOA, the account manager's percent payment can end up being disputed.
Without an LPOA, after a profitable month, the client can change the password and send no payment.
Any account manager suggesting managing an account without an LPOA is very likely a scammer.
Any account holder suggesting managing an account without an LPOA is either very foolish or is planning to scam the account manager.