There is a surprisingly large amount of decent* riding to be had around Hertford if you know where to look. It’s Classic XC – field/bridleway riding with a few tricky singletrack sections in the woods. Most is best saved for the summer though; as it's rather muddy out there at the moment!
I'm looking to set up a casual mountain bike ride on Sundays starting from Hertford North Station if I get enough interest. Email in profile.
*Yes I know it's not the Peaks, Quantocks, Highlands or Llandegla but it makes me smile.