Copy trading is allowed on both forex and futures accounts, as long as you copy from a personal account that is legally tied to you.
You may copy trades between your own non-FTUK account and an FTUK account.
You are not allowed to copy trades between FTUK accounts, even if they all belong to you. This applies to forex and futures.
Placing the same trades on multiple FTUK accounts is a violation. Trade each account independently to diversify your risk.