Hi Steve,
I have stayed at Callow Top once, when we were invited to join some friends. It wasn't my cup of tea either. If you like big sites, with pubs, clubs and noise, then it's probably ideal. Oh, and the entertainment was when the Police arrived in the early hours to sort out a fight on one of the site's fields! Granted it was in May 2008, but I'm not in a hurry to go back.
Clover Fields Touring Park is an adults only site near to Buxton, which I recently visited and would certainly be very happy to return to, although it's an ongoing project with building going on. Having said that, in no way does the development impact on visitors. Facilities are spotless.
Nigel.