I went to Thorpe on Tuesday last week, they were running 2 trains on all the major rides (apart from Saw obviously) and none of the roller coasters could maintain a queue of more than 5 minutes. They were even letting you get off Stealth and jump on the train in front if there was nobody in the bay. The only thing we queued significantly for was Tidal Wave, which was only running 1 boat.
I then went to Towers on Wednesday which seemed even emptier. Nemesis was on 1 train operation, Air on 1 station, Oblivion was only loading in the front part of the station and they also took a "shuttle" off because they couldn't fill them. The summer holidays are normally quieter than school trips week, but not that quiet...