Porlock, was part of my Area, as was Lynton/Lynmouth, fortunately by the time I did it, 1980`s, I had a "Modern". If that is what you could call a Mk3 Escort. 😁 The Peugeot 303 diesel was the best on that one, as was the BX, the Later Astra (Automatic), was quite poor.
Been up, and down, Sutton Bank quite a few times. Anything over about 30ft is going to have a hard time getting round the hairpin, especially if something equally as big is coming down. On the lorries, I was glad of the "jake" brake. The R-V (6.5Chevy) made a fist of it Ok, albeit slowly.
Pete