I was at CP Longleat recently and was told by them that it's now possible to book day trips via the local tourist agency in Warminster and I think Bath. I wasn't told you had to be local, just book locally. Might be worth checking out. It sounds a really good idea, and makes CP doable for a normal weekend when you only have Saturday and Sunday. If the local tourist agencies are clued up they should be able to recommend B&Bs nearby if you can't do there and back in a day.