hi there, i'll be in london for 6-7 days in late april with my two children (age 6). i used to live in london, but this is the first time for my children. i'm planning on taking them to all the city's greatest hits, plus a show (matilda matinee) and maybe a city farm, but i'm wondering if there's some fantastic day trip i've not thought of that they would love and would be appropriate for children of that age. stonehenge is out of the running (i don't think they'll really get the significance at their age) and they are just starting to get into harry potter so we'll save that for when it's really meaningful to them.
any ideas would be much appreciated!