Couple of places DH and I have spent romantic weekends:
Lynmouth in North Devon. We stayed at The Rising Sun - an old smugglers' inn. Really cosy, lovely rooms, great views of the harbour. Very nice food. There is a website for the hotel/pub.
We also had a lovely break at the Tregildry Hotel near Falmouth in Cornwall. No website that I can find. Lovely sea views and great food.
K-West in Shepherds Bush is a great hotel too - fab rooms. A superb Moroccan restaurant just up the road. DH and I had a fab break there a couple of years ago.