I would be up for Sat the 8th - sounds like a great way to start the day.

Saturday mornings make me think of the track at Herne Hill (near Brixton) which has meetings on Saturday mornings. I haven't been to it yet - have you Techone? The only problem with that is that there isn't a huge amount to see on the way to the track and brixton is better on foot than on bikes.

Could do a sight seeing trip around central, head down to south bank and borough and its market (loads of good quality food), then up through central to camden, angel, islington then head out to the east and Canary Wharf. Could carry on to greenwich if people feel active. Could add Herne Hill between borough market and camden.

Ironically I am about to hop the pond the other way to nyc and maryland for a two week holiday so looking forward to a decent burrito there.