I know NA well...I won't tell you what my son says about it!!
There is a lovely there and back run from Shipley Bridge to Avon Dam. About 6.4K in total that it is a water board access road which runs along the river Avon with rhododendrons dipping their flower laden boughs in the river and the open moor acting as an amphitheatre with sheep, cattle ponies all watching you.
If you want grid references, let me know.
Bigbury on sea is a good spot for running. A pretty big double-sided beach with an island to run on and explore...not to mention a pub for a pint!
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