I double booked myself this weekend, and the other option for me was
@jayonabike 's 200k Oxfordshire run. To be honest, I was favouring that one as it would have been a bit of a challenge as the longest ride for me since Southwold FNRttC last August. At the moment I'm with this one because the Colnago is in for a service and needs a gear hanger that hasn't arrived yet. 200k isn't (for me, at any rate) do-able on a hybrid, let alone a Brommie.
Thus, I'm still in.