Hi Andy,
I've corrected the small error in bryn bach park. I must have forgot to delete  it when moving the cycle path to the footway. 
I have been keeping an eye on it as part of keeping the A465 updated between hirwaun and merthyr. I didn't notice the issues further east.

The Hirwaun junction should be complete now. I believe the plans showed the cycle path simply going around the footpath of the roundabouts but would need to survey to be sure.

The missing section by Clwydyfagwyr is still very much missing, this part is prob under the most construction atm. 

Where the path deviates at Ebbw Vale, I would say the north path is the correct one as it goes past a new view point that marks the highest point on the A465 next to the layby.

There is a marker sign visible here https://www.mapillary.com/app/?lat=51.794811104118&lng=-3.2406067041258666&z=17&pKey=828924529172279&x=0.6828198013385215&y=0.5073284517773355&zoom=0.23349817312209759&focus=photo

I will prob survey the cycle path here next chance I get. its only about 10 mins from home. 