Helicentre used to have bases at Blackpool, Liverpool, Coventry, and maybe somewhere else in the Northwest, all owned by the same person. That changed - some sold off or whatever - and the three mentioned above are now all separate organisations and have been for quite a few years. That was as of a couple of years ago anyway. Since then some of them may have branched out or opened at other airfields; I've no idea. In the past I've tentatively contacted both Liverpool and Coventry Helicentres regarding instructing work; they seemed pleasant enough, seemed to have reasonably good reputations....but didn't have any work at the time.
Sorry not to be able to tell you any more.