Ok I didn't mean for this to be a slating match of the Cotswolds. Sorry Cotswolds dwellers you do have a gorgeous part of England and we are lucky to have it!
I also LOVE the lincolnshire wolds. Salmonby, Fulletby walk I did once was truly England at its best.
My loves (and having spoken with others IRL)
Oundle, Stamford Rutland Area - gorgeous but I grew up here so got the t shirt on this one.
Derbyshire - Bakewell
Lincolnshire - Wolds
Norfolk Suffolk - Really gorgeous, lavenham, framlingham, burnham market, holt.
Herefordshire - the whole county is wow
Devon - East Devon and North Devon around minehead are lovely!
Hampshire - Stockbridge is LUSH
Sussex - billingshurst, Arundel - lovely.
Essex - North essex is stun!
Northant - North East, North and also west northants basically feels like the cotswolds (without the AONB tag).
Any others? I don't know the north super well but everyone like Malton area in Yorkshire!