Great britian tour?? London tours??

Hi all,

ok, quesions..
- has anyone done the 8 day great britian tour?? is it worth doing?? (19th july)
(also this isn't a guaranteed departure date - is it likely to be cancelled?)

- also London..
before or after contiki? does it matter that much?? (i was gonna do after so to have met people, but doing it before makes more sense with work - as the tour starts on a tuesday - leave Aus before the weekend)

- how are people doing london?
pre-booked contiki? the hop-on-and-off bus? (you dont book this one right?). or just walking around? (the walk sounds good to me, and maybe the bus?)

- does the great britian tour include much of london?

- and is 3 days in london enough??
(i've been reading a london book just today, and think i wanna see the main stuff, prob not musems or churches - unles they're famous, 'must-sees'. maybe a bit of shopping too, street stalls, harrods (but not too much shopping, you can shop anywhere)