We were at Chessington yesterday and saw the new queue system on Tiger Rock and it made absolutely no difference to the queue. Unless I am missing something I don't get the new system, we saw them multiple times send a boat of two and then a boat of three - surely the point of the system is that the three and two go together. Just to top it off they were taking guests from the groups of 3 or less line more frequently than the other line - so for example they would send a boat of 3, then a 2, then a 3 and then take from the 4 or more queue. So three or sometimes four boats would go with threes or twos in it before a bigger group got their turn.
On another note, ride availability yesterday was poor - so poor in fact that they activated the free return policy. Mandrill Mayhem and Dragons Fury were down all day. At one point, those two along with Blue Barnacle, Ostrich Stampede, Rattlesnake and Tiger Rock were all down at the same time. Vampire almost got through the day but went down towards the end as well. This was on top of Monkey Swinger and Tomb Blaster being closed all day as well. It was not good.