Urgh, we were there last week and it was that playground that made us decide enough was enough and leave the park.
It's too busy and was designed so badly that you cant keep track of your kids unless you follow them all over the place. The big slide was blocked off at the top and bottom which meant all the kids venturing up there had to come back down the same way that hundreds of other kids are trying to get up - so loads of little kids were getting pushed off by the bigger kids.
We felt the playground wasn't safe because it was overcrowded and we couldn't see where the kids were within 10 seconds of them running off.
I'm saddened but not totally surprised that something like this has happened there. Legoland need to take a good long look at their responsibility in this.