Years ago, possibly 2002 or something, I did a ride with a friend.
He got it out of a magazine.
It was the full Brecon gap ride.
I've drawn what I remember of the route here:
I'm just wondering if someone has the official route.
I remember cycling through the end of Merthyr, but I'm a bit sketchy about the route back to the start after the big climb up from the Brecon valley.