Hang on a minute..........!?!
I could certainly help with photographs at the start of the trip. In fact I'd be delighted to do so.
Heading south from Gloucester keep to the left of the river, and cross the Aust suspension bridge when you get that far. All the online route planners will suggest this I'm sure.
The Gloucester-Sharpness canal is about 16 miles long and gives a viable off-road route out of Gloucester. I've ridden the whole length and I think it's permissible, but the online route planners seem to prefer to put you on the roads, many of which are part of the NCN. Using a combination of both you can get to Aust having barely put a wheel on a busy road.
Things are also quite good between Chepstow and Newport. I don't think there's so much scope for off-roading but the A48 is almost completely avoidable. Beyond Caldicot there's a network of very quiet minor roads near the coast taking you most of the way to Newport.
It's well worth using the transporter bridge to cross the Usk in Newport if you can, but you'll need to research opening times.
You can judge whether I've lived up to
@Heltor Chasca's billing.
