OK not many UK users here by the looks of things.
It's also the weekend and the forum's a bit less busy. Maybe you should just make a list of hosts using whatever sources you can (findyourhost.co.uk) and then use the search feature
to find some (older) feedback.
I do know there are a few UK hosts with good reputations, but one can only make recommendations if he/she has fisrt hand experiece with the host, so I must let you discover them yourself. At least now you know there's something to be found out there.