We're looking at our kids first 'holiday' in London (combination of severe travel sickness and funds means London is ideal for the kids atm - we're limited to trains only as neither child can last 5 minutes via bus, car or boat before vomit). Does anyone have any recommendations for activities? We're planning the zoo and natural history museum so far. Ds is 4.5 and baby girl is 1 so doesn't really care provided there's food!