If anyone needs a London-based 20 mile warm-up for their Spring marathons, my club's race is going ahead soon. Entries here:
https://www.eventrac.co.uk/e/thames-riverside-20-3839?fbclid=IwAR078M6NrtD5SJnbDZx-RVOpas2xvBCGvxgzuFMzOMZi4OLDsJHLX3Ifal8Race takes place down the Thames Path and there's plenty of cake at the finish.