PC - Sounds like maybe a nerve thing? Try ice on it and see if that helps.
TD - you post some pretty hardcore stuff on here, especially the cycling you've been doing recently. Could be that some easy stuff would help you to build up your immune system again (or are you doing that anyway but it's just too dull to tell us about ?).
Slow Duck - don't worry, you can tell me all your Comrades war stories for 11 hours on the plane (and Wilfmannion too!).
Tip for those staying in City Lodge who like to travel light. I never normally use hotel laundries, but they have an excellent, and cheap, service which I used last year. Handy if you don't want to pack a lot of clothes.
Southwark ticks your boxes - flat, tarmac, in a park near Surrey Quays and Canada Water stations. Not that fast as it's 3 laps and there's hairpin bend at one point which slows you down, but otherwise quite nice.