hey mate, Richmond Runfest still have places open for their 10K race on May 15th in the lovely surroundings of Kew Gardens (the day before the marathon) if you fancy a family trip up and have a go at the "Devil's Distance" https://www.richmondrunfest.co.uk/
It's the same day as our game v Man City but hopefully we'll be fine by then.
I was looking at Kew, but with a view to running the marathon.
Also Goodwood has a range of distances from 5k to marathon so considering a fast 20 mile race there, followed by Kew for the full distance.
Are you running in either event?