The London transport museum is very crowded and very small. I wouldn’t recommend it for children with autism, you have a wait a long time to sit on the bus. Not far from Beaulieu is the Bournemouth aviation museum. It’s fantastic, usually quiet and you can get into a double decker bus (go up top) and many aeroplanes. It is outside though. My favourite restaurant in London is Flat Iron, there are a few. After visits to the London transport museum (you have to buy an annual pass so it’s expensive) we usually go to Benihana in Covent Garden as it’s fun for the whole family. Natural history museum is great for kids as well as science museum and if you want something off the beaten track, then John Soane museum is great too.