Don't forget the RICS (Royal Institution of Chartered Surveyors) will be open again.
You can sit in the comfort of the BAR watching the action on tv eating good food (chips with mayo went down well at the Tour of Britain) or you can use it as a base - there should be some secure bike parking - and plenty of loos!
My old colleague there and Kingston Wheelers member, Lindsay Pullen, has organised this following a successful trial run on the day of the Tour of Britain. Those ACCers who went can recommend it! Someone had 7 pints if I remember rightly
The RICS is on Great George Street/Parliament Square - more details nearer the time or see me!