Hello,
Somewhere through the maze around he Heads of the Valleys, there's a signed cycle route, NCN 46: http://ra.osmsurround.org/analyzeMap?relationId=173236 .  However, as you can see from that it's not been updated since the recent construction.  I wonder if you've seen any signage around https://www.openstreetmap.org/relation/173236#map=19/51.784266/-3.272835 , as that's one bit that's obviously not correct any more?
Best Regards,
Andy