We had a family weekend in London in March and this was one of the places we visited as we needed something to keep 5 children entertained between the ages of 3-10 and it pretty much did that.
It's not a cheap visit and would only recommend if your kids are really into Dinosaurs. Also, if you're expecting this to be the Jurassic Park style experience, you will be disappointed ...
We spent two hours there - and there was more than enough to see/do. Our tour group had some kids who were very into their dinosaurs and our guide could answer all their questions without hesitation.
The tour lasted just over the hour then the kids were let loose on the interactive activities that were dotted around the place. The paint your dinosaur was their favourite but they also enjoyed the fossil dig, the jigsaws and the computer puzzles and quizzes.
There also activity sheets for the kids to answer
as you go around ... but these were located where the vending machines are (half way round) so we didn't realise they were there until we'd finished the tour - our kids would have prefered to fill them in as they went around.
Oh, the other part the kids loved was travelling to the O2 using the Thames Clipper.