The land is owned by Nabatean Limited, company number 02851588. Its registered address is Craven House, 16 Northumberland Avenue, London WC2N 5AP. Details of the company can be found here, on the website of Companies House.
The company is owned (more than 50%) by the Earl of Plymouth, Ivor Windsor-Clive.
His address is given as:
Oakly Park, Bromfield, Ludlow, Shropshire, SY8 2JW