Thanks Mep. I ride those roads myself, both Exmoor and I went on to watch your Dartmoor ride too. Lovely in the summer but I must admit, I usually only ride across Dartmoor in winter to get to the other side in the straightest line, usually through Princetown and onward to Plymouth.
I will be doing the Whiddon Down to Plymouth ride one day very soon (probably in lashing rain) to have my MOT done. I could have it done closer but the rules permit me to go to where ever I book it in and I always go to the same place where I know I will have a fare test, pass or fail.

Exmoor is a more beautiful ride and better roads for me because the 40mph limit is a bit of a killer on some stretches of Dartmoor.