Hi Pussycat15,
Unfortunately I do not know of any UK single holidays in the UK were you can take your dogs.
But I use this web site: www.dogfriendly.co.uk that list all sorts of accommodation, B&B's, pubs, restaurants, attractions etc were dogs are allowed.
Our next holiday in September is to Devon valley camp were dogs are allowed in selected chalet accomodation. Previously we have visited a farm house B&B in Somerset that allowed dogs. You will find lots of places on the web site I have given you.It lists various area's of the UK that you want to visit.
All the best
Regards
Eric