Good call Martin. Having had my memory jogged I agree that stretch is pretty dire at the best of times so I will avoid it. Trouble now is, I want to do the long climb from mile 14 up to Shirenewton but with the M48 off limits for obvious reasons, the only way to get to it from the Wye Valley link road is via the A48. Ah well, it's only a 3 mile stretch.
If anyone has downloaded the original route from rwgps, I've now amended the route so you can download it again.