"There is nothing else of this size with this degree of privacy. It will sell quickly and for the asking price."
The property, which is located out of sight from any roads of cars, was originally two 19th century lodges converted into one.
The average house price in England and Wales stands at £164,000 and the mansion is expected to incur a stamp duty charge of £7.35m.
The new owner will also gain a five bedroom home and along with two one bedroom flats which amounts to just under 15,000 square feet of accommodation.
The property also comes with planning permission to add an extension to include a 50ft swimming pool along with gym, cinema and three more bedrooms.