I travelled recently on a smallish Scotrail train to Edinburgh on a Friday evening. On the table next to me were a couple in their 50s who brought out a red-white checkered table cloth and crystal wine glasses, like a posh picnic. With inimitable style they mixed lemon Fanta with Gordons Gin in their crystal glasses, but wisely kept the Gordons in their bag to avoid too much provocation. They behaved well, just their faces started to colour-match their table cloth by the time they got to Edinburgh. The conductor did not mind. If anything, I think he was a bit jealous.
(This train terminated in Edinburgh and was going no-where the English border)