Gueterbock inherited his maternal ancestors' ancient title of Baron Berkeley in 1992, succeeding his aunt Mary Foley-Berkeley, 17th Baroness Berkeley. Lord Berkeley additionally became Baron Gueterbock, "of Cranford in the London Borough of Hillingdon", in 2000, but remains known in Parliament as Lord Berkeley. His life peerage enables him to continue sitting as a Labour peer in the House of Lords, following the ejection of the vast majority of hereditary peers in 1999; he was not elected a hereditary representative peer.