I checked out Capita and it looks promising.
Am I right in thinking that with Crest you transfer your shares to something along the lines of a nominee account with a broker, which no doubt is a safe home, and if you want to deal over the phone or internet with another broker the holdings/account have to be transferred to a 'nominee' account with them.
I'll check with my stockbroker, if they can remember who I am

and get confirmation of any costs involved, not least in potentially transferring my account to another broker at some future date.
I'll have to do some homework on the less expensive brokers.
Many thanks Interactive.