Mereworth Castle is owned by Mahdi Al - Tajir who purchased it in 1976 for $1.2 million .
Mahdi Al - Tajir is the former United Arab Emirates ambassador to the United Kingdom and owner of the Highland Spring bottled water company .
Mereworth Castle is owned by Mahdi Al - Tajir , the former United Arab Emirates ambassador to the United Kingdom and owner of the Highland Spring bottled water company , who purchased it in 1976 for $1.2 million .