I think most of us think theme parks are a good thing and the rest think they are good whilst bashing.
I've had a look and put together a small list of parks to see where we fancy going.
Up north is Flamingo Land, it is a crap theme park and a crap zoo but put toghether you can have a laugh there.
Midlands is Alton Towers or Drayton Manor. I think Drayton Manor has been visited already. Alton Towers is the daddy of theme parks in the UK but queues get pretty long.
Down south is Thorpe Park, Legoland and Chessington. I think Chessington has a few animules and some rides but I think its pretty kiddiefied. Thorpe Park is Alton Towers for Southerners. Legoland is supposed to be for kids but if you don't say anything I won't.
Back when our kids were kids, we quite irresponsibly took them out of school to visit Alton Towers and The American Adventure (now closed) - the queues were okay on schooldays. Also there's Camelot in the NW, but I don't know much about it.
Assuming I have the money (and kitchen pass) for any, I don't really mind. Of the ones I've been to I enjoyed them all. Flamingo Land has a zoo too, and was where this was taken:
Had a similarly brilliant one from Alton Towers with a log-flume full of us wearing Hallowe'en masks (in august).