The Flying Scotsman is a sweeter and slightly more bitter relative of the classic Rob Roy cocktail. The Rob Roy was created in 1894 by a bartender at the Waldorf Astoria New York and named in honour of Rob Roy, an operetta which was loosely based on the life of Scottish folk hero Robert Roy MacGregor.
Pour all the ingredients into a tall mixing glass, or even better – and a touch more stylish – a classic cocktail shaker. Add plenty of crushed ice, then stir or shake and strain into a glass. This is a good old fashioned cocktail, so go for a chunky and appropriate old fashioned glass. The sweetness of the Italian vermouth varies by brand, so you might need to adjust quantities of this and the syrup, depending on how sweet a tooth you have. That said, the sweetness is a key part of the appeal so make sure you don’t lose it altogether.