I went on the London Eye and River Cruise thing yesterday. I've never been on the Eye before, definitely worth doing (although we didn't see anyone shagging in the next capsule). The river cruise thing was fun too, the narration was brilliant, with lots of jokes I'm sure you'd miss if your English wasn't too hot. I never knew Sommerset House was locally known as the "hatch 'em, match 'em and dispatch 'em" office. You learn something new every day ;-)