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.
Jeremy Lascelles Robert Jeremy Hugh Lascelles (born 14 February 1955), is the third child of George Lascelles, 7th Earl of Harewood, and Marion Stein, who later married Jeremy Thorpe. He is a great-grandson of George V, so he is a second cousin to the Prince of Wales and is in the line of succession to the British throne.