I've never stayed here, but have been to a sister hotel and it was absolutely top notch:

http://www.oldswanandminstermill.com/

There's another place that's absolutely beautiful in Bourton on the Water where I have stayed a couple of times and that's the Dial House - http://www.dialhousehotel.com/

Am sure there are hundreds of other similar places out this way but they're not cheap and especially at weekends you might struggle for a one night stay.