we were in london few yrs ago for a wedding and spent 2 days sightseeing, we did bus trip, madame taussauds, london eye, thames cruise, took a stroll around some of the main areas etc.
when we were there 7/7 bombings had just happened wk before so many tube lines closed and feeling of unease around the place so don't think i enjoyed it as much as i would have at other times