We fly out this Thursday and come back Oct 2nd. We're in London itself from next Wednesday until we leave. The rest of the trip will be driving around the Salisbury Plain area.
I heard back from the London Eye press office. The idiots just copy/pasted a line from their website about no tripods or large lenses in an email and added greetings and a sign off. They completely avoided answering either of my two questions. Screw them.