Mile End to Cambridge
About 65 miles, leaving London on main roads as far as Epping Forest and then via minor and B roads. Lots of undulating countryside including the highest points in Essex and Cambridgeshire. Pub/cafe lunch after about 30-35 miles. Return by train (between £7 & 14).
Medium pace but not many stops, bring enough snacks and maybe a thermos flask of something hot to keep you going! Drop out points for train back to London possible, also if you want to be picked up in Victoria Park/Hackney/Lea Bridge Road it may be possible.
Note that in the event of really cold weather with the risk of ice, this ride will not go ahead as the lanes could be very slippery - contact ride leader the evening before if you want to know whether it is on or not.