He was the last partner of Michael Pitt-Rivers and inherited from him the Rushmore Estate in Wiltshire.
After his death in 2016, Gronow-Davis's art collection was auctioned by Duke's of Dorchester.
[4] When Pitt-Rivers died in 1999, the Trust which runs the estate was inherited by Gronow-Davis.
[5] The Rushmore Estate had been in the Pitt-Rivers family for generations and includes the Larmer Tree Gardens pleasure grounds.
[1] At his death, on 20 September 2015, the Larmer Tree Gardens estate was valued at £50 million.