Star over London
Having just been up in the zeppelin I can tell you it's a relatively quiet experience. Most impressed with the manoueverability (spelling?!) of the airship....handles more like a helicopter than a plane....apparantly. If you've got a few squid burning a hole in your pocket then i'd recommend one of the trips. Seats around 12 pax with a couple of windows that you can open to take some great shots out over london.
All i need to find now is a single-man version...would make the commute to work much more civilised...