I loved London, as there is so much to see and do! The London Eye is a must see, which was built for the millennium, other sites to see would be Westminster Abbey, with the famous Tower of Big Ben, take a cruise on the Thames River, London Bridge, Buckingham Palace to watch the changing of the guards, Jack the Ripper tour, and many more. For you shoppers, Harrods's Department Store dating back to 1849 & Oxford Street. London has great neighborhoods to stroll thru, such as Shoreditch, Soho..
There are several day trips from London to Bath, Stonehenge and if you are a Harry Potter Fan, this exhibit is a must see!
It's about an hour outside of London, and there are tours with transportation and tickets available, but you have to book early and this exhibit is very popular.