The Three Sheets is just a pun (Three Sheets to the Wind meaning somewhat sozzled), the ‘Covey Crumpets’ offered on sale is a nod to Commander Covey Crump, who served in the Royal Navy and in the 1950’s published a book on naval slang. The advert on the side of ‘Veitch’s Leeches’ reads “We will bite them on the features’, which is another pun on Winston Churchill’s famous wartime speech; “We will fight them on the beaches’.