In the spirit of self sacrifice, I sampled the 3 ales at the Queens Head (Boreham) tonight, and had a chat with the landlord. I also comfirmed that the 86.4" track fixed is not a set up for leisure rides.
Beer and service is good (Timothy Taylor Landlord, St Austell Tribute and Proper Job). Plenty of outdoor space, covered and open. Bike parking is available but a bit of creative use of garden infrastructure is not a problem for a larger turnout
Opening hours are going to revert to normal when the trade is there, so it becomes an option for MEMWNS when the world restarts.