To hire a house out for the weekend that also doubles up as a wedding ceremony venue will cost an awful lot of money. If you have a healthy budget then I would highly recommend the bijou wedding company:
They have 5 exclusive houses to rent which you can get married in. Their philosophy is that you rent out a luxurious millionaires house for your friends and family to chill out/party in. I went to a wedding at Cain Manor in Farnham and it was one of the best weddings I have ever been too as the venue was stunning and the quality of service was faultless. The accommodation is a little limited but other guests stayed at hotels nearby and hung around Cain manor during the daytime. Warning - this is not cheap!!
I know another person who's daughter hired out a house in Gloucestershire for the weekend but can't remember what it is called. I'll get the details and will get back to you.
Met: 17th August 1990 Got together: 18th October 2007
Proposal: 8th April 2012 Getting Married: 30th August 2013