The event takes place on the U109/50 course (Strava segment: https://www.strava.com/segments/15791665), which is 3 laps of an undulating triangular circuit on the edge of the scenic Cotswolds.
This year the HQ is Hawkesbury Upton Village Hall. https://www.village-hall.org/main-hall.html, a 3.5 mile ride from the start.