Re: Thorpe Park
I think probably the main reason is the weather. As far as I know, the south east and London area hasn't had a single rain-free bank holiday. In fact, there's serious concerns about beachside businesses maybe not coping at all.
I'm working on the theory most people use 2 for 1, so that's not really an issue. I get the feeling that a lot has to do with everyone in the parks being very spread out. think about it. you have most people heading to the swarm, which is a people eater. then, everyone from the swarm island basically head out, because from here there are really 4 directions- behind depth charge, infront of the beach, towards inferno, and towards stealth. you can literally see everything pretty well, so now people head in multiple directions.
I'm not sure, but I definitely think the main factors are weather, and people being more spread out.