Hamish and Dougal are two characters from IM SORRY I HAVENT A CLUE the Sound Charades round where Barry Cryer and Graeme Garden often tell their story as two elderly Scottish gentlemen Hamish and Dougal. Each sketch is started with the line "You'll have had your tea" with which (un)welcome visitors who have a habit of dropping in at dinnertime are reputed to be greeted in Edinburgh.
NB Humphrey Lyttleton stars in the Hogmanay special as the laird's butler, with Tim Brooke Taylor playing himself.