Chip Butty
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The term 'butty' for a bread sandwich certainly goes back as far as Gaskell's novel 'North & South' of 1855; "He's always mithering me for 'daddy' and 'butty’; and I ha' no butties to give him, and daddy's away." (OED) but we can't find reference to a Chip one before a copy of 'The Spectator' of 1972; "...common diet for Tommy, and most of his friends, consists of a packet of potato crisps for breakfast, a bar of chocolate for lunch and a 'chip buttie' for tea."
An article in the 'Gloucester Citizen' - Wednesday 06 November 1929; "Which County Eats Most Bread? Sir, —In view of the latest "eat more" advice, which English county eats most bread? I should say that we in Lancashire do. We eat more of it to the square inch than any other part of England. I, and thousands like me, was brought up on jam "butties" (bread and jam), sugar "butties," condensed milk "butties," and treacle "butties." That is why Lancashire is a greater county than Gloucestershire or any other. Bread builds brains."