Clarence House has been the official residence of the heir apparent of who?
Charles, Prince of Wales Charles, Prince of Wales (Charles Philip Arthur George; born 14 November 1948) is the eldest child and heir apparent of Queen Elizabeth II. Known alternatively in Cornwall as Duke of Cornwall and in Scotland as Duke of Rothesay, he is the longest-serving heir apparent in British history, having held the position since 1952. He is also the oldest person to be next in line to the throne since Sophia of Hanover (the heir presumptive to Queen Anne), who died in 1714 at the age of 83.
Henry Fitzalan-Howard, Earl of Arundel Henry Miles Fitzalan-Howard, Earl of Arundel (born 3 December 1987 in London), is a British nobleman and racing driver. He is the eldest son and heir of the 18th Duke of Norfolk and his wife Georgina. He was known as Lord Maltravers from birth until his father's accession as Duke in 2002.