when I was here the first time to see my now DH, we went to London for a few days. we went to the LONDON Aquarium, the London Eye, saw Buckingham Place with the changing of the Guard, Tower Of London, Big Ben, Houses of Parliment, didnt go in walked by. we also went to see the Brittish Museum, ST Pauls Cathederal but couldnt go in it was being restored at the time, we also went to see Westminster Abbey. Hope you have a good time while your friend is here visting.