Here we have HMS Enchantress at Cruden Bay. It is the Admiralty Yacht used by Winston Churchill, when he was First Lord Of The Admiralty. He liked sailing about on it, basically sight seeing when not on official business. He also often invited Prime Minister Herbert Asquith to join him on board. It was the Asquith Family who rented Slains Castle as a Holiday Home after the Earl of Erroll sold the Castle.
This picture is a cartoon which appeared in Punch Magazine, with Asquith and Churchill on board HMS Enchantress.