Best Free Attractions in and around London?

Thanks so much, this is a great list. Out of those three museums, is there one you would recommend above the othere's, particularly with young kids?

SaverDeals , i ve taken my kids to all of them , each one is too big to do all of it , so target what interests them most , so easy to overload and bore young kids , each can get crowded too , so time it right to avoid less crowds , personally , impressionists seem to pull more interests with kids , probably the bright colours , so if you go to National gallery , go in reverse order , if your kids engage in conversation , maybe Tate modern , also free will interest them more , after crossing the Harry potter bridge , if they are fans ,

National History , is all animals of course , but Science next door has more inter active for children , if yours are boys they may like the changing of the guards too , 11 am i think at Buckingham Palace , next to St james park where you can feed the exotic birds on the lake , near by at Horse Guards is mounted guard with horse , kids love that too ...........London is great , has so much to see and do

ooh this sounds like a really good idea, thanks so much for sending the link. I hadn't thought of that but sound like a great way to sight see.