Brocket Hall has reported that businesses are moving away from the capital and other upscale properties due to the estate's ability to lock down and provide complete anonymity.
Set in 543 acres of parkland, 22 miles outside of London and 35 miles from Heathrow Airport, Brocket country manor has been host to political and governmental think tanks.
John Keating, general manager at Brocket Hall, said: "We recognise the importance of offering a trustworthy and discrete approach for this market and its events. Brocket Hall is available for exclusive hire and we have found that delegates have really enjoyed and appreciated having the manor to themselves and away from press attention."
The venue's Saloon, or Ballroom, is 60 feet in length and seats 54 delegates.