I think London has one of the most interesting and unique skylines of any city on Earth and I love the Ferris Wheel!
Interesting checking this thread out, there is a thread in the Austin, Tx sub-forum that discusses a tall observation type tower and the idea of a Ferris Wheel was floated around.
Having protected corridors is a pretty good thing. We have several Capitol View Corridors here in Austin, and they have done wonders in shaping our skyline including taller skyscrapers than we would have had without the corridors. London's skyline has much more character than a city where all the towers are clumped in one area.
just for the sake of the conversation check out the photoshopped picture on the thread.
http://forum.skyscraperpage.com/showthread.php?t=209787
I can't wait till our new BA direct flight begins next month linking Austin and London. Planning a trip soon.
Cheers!