FWIW My favourite area is mid Wales between Machynlleth and Llanwyrtyd Wells, miles and miles of natural going which is to be found on Landranger 135,136 and 147 Monks Trod isn't that bad, rode about 80% on the Welsh Ride Thing this year, the watersplashes from Strata Florida to Llyn Brianne is a classic as is the track across Hyddgen Moor from Mach to Ponterwyd.
SSSTU, I also did the Welsh 2 Day the last time it crossed the Trod in the late 80's, remember it being particularly wet. Came across a guy just standing in the middle of a huge bog in Tarenig forest, when I got closer, I realised that he was standing on a sidecar which was buried up to the tank in mud, I think it's still there.Do you remember the Welsh where they redirected cutting out the Trod as a plane had crashed?