Have you seen the Xdurowales route on the Racing Collective website. Im in Snowdonia and i really enjoyed it

Again near Dolgellau maybe look at incorporating some of the Mawddach Big 8?

http://www.mawddachestuary.co.uk/cycling/mawddach-big-8.html

For a rider to be considered as one of the MB-8 elite, the journey should be done as two back to back 1-day rides, the North Loop and the South Loop. Double-Loopers will do them back to back on the same day.

Top tip – I’ve been been working out a ‘big day’ gravel loop in the Cader Idris area. Am finding that Google Earth app is of late showing a few more unsurfaced sections at the ‘street view level‘ (if you click the little person and zoom in, looking for blue lines and also ‘photosphere‘ locations showing as blue dots) Currently only showing the odd section and often just the tarmac section up until it peters out into a track, yet I find very useful when scoping stuff out from the armchair.

We did the Abergavenny -> Shrewsbury national cycle route. Quite route mix of road and gravel but there was some extra more off road diversions. We did it very relaxed but I think 2 days would be a nice comfortable time with time for one lazy camp

For everyone’s interest a couple of yrs ago here in the new forest the national park hooked up with google and google mapped the whole of the gravel track cycle network. That means you can drag the little man onto the network and see what the surface and scenery is like. I had an idea that other national parks did the same?

I’d not do do the TCW on a touring bike. Sure it can be done, but a fair few sections would not be pleasant.