What it costs with a rather large victorian house and a for British standards, a rather large garden, is another 100,000 quid.
For that you get a lot of glass wool, several wood burning stoves, two or three turbines and a rewire job, a new roof and several outbuildings including a rather perilous looking outhouse loo.
I know what I'd have done with the =A3100,000.
Still if you factor in some very average hand held film work (probably cadging help the way they got the gardening done) the initial outlay would be amply repayed in the TV series.
Of course turning your wife into a vegetarian in the process could be an added expense.