Update on road condition (as of tonights extended commute):
Bumford Lane (aka Bumfords Lido) is dry, a few damaged edges to the tarmac which aren't a problem, the mud from the banks which the twats in tin boxes have ploughed onto the tarmac (avoiding the edges) is easily passable. Recommend robust tyres that can survive the inevitable flints mixed in with the fresh mud.
Spotsmans Lane - alternative to Bumfords Lane - avoid, features a well established stream across the road in places with algae to aid with lack of grip on the long term frost damaged knackered bits.