Nicely done, well-written and photographed travelogue Alex – thanks for sharing.
I did it north to south as part of a trip from the Isle of Anglesey to the Isle of Wight a few years back on a one-panniered Cotic Roadrat with 23c tyres on it. There were a few bits that jangled my fillings as a result. Inappropriate gearing saw me pushing the bike up a couple of hills, especially on the section north of Barmouth. Same stretch also featured some grim weather that had me questioning my sanity about doing it at all.
Highlights included meeting a guy who worked for the council in Carnaerfon who ran off and got me a guidebook for the whole route from his office simply because he “liked Scottish people”. ‘Mon the Celts! Llanidloes was a nice stop which for some reason was jumping with stag and hen parties on the Saturday night I stopped there.
The best bit of the route I did, which went via Chepstow rather than Cardiff, was the climb out of Hay on Wye and the descent into Abergavenny through the Black Mountains(?)
Further down and across the Bristol Channel the section between Bath and Devizes along the Kennet and Avon canal was really nice too.
I agree about this kind of touring being a different buzz to mountain biking; also to supported point to point road touring, which I’ve also done a bit of. Nice to be able to step up the pace or take it easy depending on how you feel on the day. Definitely going to look into the frame bags thing as opposed to having a pannier for the next one. Hoping it makes the bike handling more fun.
Next similar trip I have my eye on will be the “Voie Vert” from Caen to La Rochelle down through Normandy and the French Atlantic coast.