CSWS- Yes I was at that Robbie concert. We went on the train and walked there and back from Stevenage station (I think), it was fine on the way but a little more difficult traipsing through a field in pitch dark on the way out.
I'm not sure about adjoining rooms but apparently they have only been open a year so it might be possible as it's very modern.
The children can go on lots at the Transport Museum, it's really child friendly.
There are tube simulators to drive, a tube to sit in, an old style steam tube train to get in, two modern buses which they can sit in the drivers seat on, an old trolley bus to climb up and then a small play area with wooden vehicles, taxi etc to play on and in.
DS can be very stroppy and his favourite thing is to cross his arms and shout 'noooo' quite rudely. He does sometimes hit, he actually slapped me in the face today
in mid tantrum over going to the toilet. Both dh and I get really cross when he does hit and won't accept it. We use the corner when he has hit/been stroppy or rude/repeatedly refused to do as told, which is an adaptation of the naughty step. I have no idea if this is a good way of parenting but it does work with ds. He has to sit there for 2 mins (which really is about 30seconds normally as he is mostly immediately sorry and I figure he has no real concept of time) and we tell him why he is there, then we go and get him and tell him why he was there and he will say sorry. I've also used the corner when we are out and about, in the middle of BHS once, again I'm not sure if this the right thing to do but it is like my crutch to lean on.
We also use the timer a lot for him as many of his strops come from having to stop playing to go out/eat/go to bed, so will tell him we are putting the timer on and then give him a few minutes to play and then he usually comes happily. I stole the timer idea from my Mum who used it with my youngest brother who was a sod challenging. It works well with ds.....at the moment.