I am planning for a 10 days visit to London.We will be staying at our friends house in surrey.?

Can u provide us a 9 days iternary to visit all the major attractions of London city.Also would like to cover bath/Stonehenge in a day.We will be travelling with our kids aged 9 and 4.So wont be preferring a tight schedule.Also would liek to know whether the grocery shops keep fruits,juces,buns etc.Will it be cheaper?Pls advise.