Be aware that the "London-Surrey Cycle Classic", a test event over the London 2012 cycle road race course will be running on 14 August, expected timings (and other info) at http://www.londonpreparesseries.com/...ule/index.html The first back should reach the Mall not long after midday, but the extent of road closures hasn't yet been announced, so anyone heading to the Proms Plus Sing: Choral Sundays event in particular should keep an eye out for further announcements