I usually do the NYMBO series, but an injury & lack of fitness have keep me away this year, there is an event this Saturday 9th, the pre entry date has passed but they usually print some spare maps for entry on the day, its as easy or as hard as you want to make it, you can ride as a pair, they have age group catagories and pairs/generation catogories, I have seen younger than 11year olds riding, usually with a smile on their face.
The map without controls for ths weeks event is on the website.
https://nymbo.org.uk/