Hmmm. Good point. There is this one...
http://www.rightmove.co.uk/property-for-sale/property-35009361.html
...bit more of a stretch at £12 million, has a more acceptable 507 acres to play with....but it is in Surrey, so there is a considerable downside.
Here you go: a fifteen minute walk from Haywards Heath Station, eight bedrooms (that's what you were after, right?), 20 acres of gardens, vast outdoor swimming pool, several garages for the Ferrari collection, and a couple of spare cottages attached in which to house the good lady when she's in...
Some lovely places in the Mid Sussex area, good for commuting (well, as good as commuting can ever be with that cavalcade of shithousery currently running the trains). Superior to, say, I don't know, Worthing :p