I saw a helicopter fly over the front of our hotel yesterday morning. it was following the Thames and we were opposite The Tate Modern and Big Ben was just diagonally opposite and the London Eye was to my right on our side of the river and Horseguards accross the river to the left, and so I guess that is the tour you will be doing! It must be amazing from the air. I saw Battersea Power Station for the first time too, that was jst over the Vauxhall Bridge and I was amazed at how big it looked It will be excellent as you will see a different aspect to everything, like into the inner courts of the famous buildings, and you will see just how close everything famous is to one another too i guess. I am envious, what a brill pressie, take the cancorder!