We have booked a v last minute London trip. s this worth trip out of London for a day? 4 kids aged 9-17, so won't be cheap. We're unlikely to book it as a separate holiday so reckon it's now or never. Oldest two have been to Disney, younger two haven't. We don't travel often. We all have lots we'd like to see & do over the 4 days already; should this be on our list?