Seen it twice
We live in Greenwich and I took the kids to see it a few weeks ago and thought it was great. I have two daughters, 8 and 6, and the six year old was a little nervous but both loved it. I thought it was brilliant as well.
I then went to see it with my daughters school earlier this week. I was one of the parents you see stopping the traffic to help the kids cross, we weren't aware the school was doing it when we went.
The kids loved it just as much as the first time, they were warned not to tell the other kids what was going on. To be honest I enjoyed it just as much.
No idea whatsoever what this has to do with IT but its a great show and if you can get tickets go and see it.