i think the majority of what gentlemand has said in this topic is correct

UK banks have not really had a problem with crypto currency itself (from my and others i knows exprience). the problems that have arrisen are due to:

1. the person that gave you £££ then called their bank and said they have been scammed(lie) in an attempt to get their funds back. this sort of action is rampant in other industries too. its usually called chargeback scamming

2. when moving funds from an individual(not business) and paying out to another individual in a short period repeatedly does raise a red flag. as does moving more than £1000. this is usually where business accounts offer more flexible utility. i know some may think that just moving money around is 'personal' but to banks larger amounts often and to random individuals is a business flag

UK banks dont freeze accounts simply because a transaction smells a bit bitcoiny. they freeze accounts due to pre set AML flag policy and for fraud/theft enquiries. thse policies they follow have existed even before bitcoin

you might find that if funds are to be sent back to originator, then its because the originator has done a chargeback scam on you, to get your btc. and then get the £££ after