Davy, Geoffrey (and Arnold Izap if still a possible) - what works best for you - Wallingford or Marlow?
Is there a sensible place for the Southern contingent to meet up beforehand?
Staines works well for me.
As for Wallingford v Marlow - I sit on the fence given that I wil bail out before Bristol so the Marlow detour will shorten my return leg.