"The main elements of the shield are derived from the arms of Andrew Durie of Durie with the replacement in base of a third crescent Or by a roundel gyronny of eight Ermine and Gules which is a symbol of the Campbells of Loudon from whom I am descended on my Mother's side via the Campbells of Fairfield. The motto "As a Rock my Faith" also relates to the Durie of Durie motto "Confido" but is also an allusion to my time as Governor and Commander-in-Chief of Gibraltar, which is often called "the Rock". The crest is also a reference to Gibraltar whose own arms (originally granted by Queen Isabella of Spain in 1502 but later adopted by British Gibraltar) consist of the castle and key described in the Blazon".
