I just came back from a UK-trip last week. The parks were all packed with school-kids. All Tussauds-Parks offer Fasttrack-Tickets. At Thorpe the Fasttrack-4-pack for Colossus, Nemesis Inferno, Tidal Wave and that Log Flume worked great for 4 pounds extra.
They now have single rider entrances to Nemesis Inferno and Rush, so that even on a full day you will not wait more than 5 minutes for a ride!