Tattie, I wasn't often in the area near Central Station, but I do remember the viaduct there being laughingly called 'The Hieland Man's Umbrella' (Harry Lauder song) as folk from the Highlands and Islands tended to congregate underneath it while waiting to meet up.

In Scotland, fish-and-chips was invariably called a 'fish supper'.
When I was teaching, I often bought a 'white pudding supper' or a 'black pudding supper' for lunch. The lady would always ask, "Salt and sauce hen?" I don't remember vinegar being offered, just brown sauce rather like HP sauce.