Gunner is also the name of a cocktail enjoyed by British expats in Hong Kong and other parts of the Far East and India. It consists of equal parts ginger ale and ginger beer with a dash of Angostura bitters. It is regarded as a non-alcoholic drink, although Angostura bitters is 44.7% alcohol by volume. It is famed for its refreshing qualities and is drunk in large quantities in the summer.
I got this pathetic line in a sideways-scuttling hostel masquerading as a mess in deepest Shropshire - damned woman refused to put a dash of bitters in my OJ and lemonade as 'they had been told not to administer poison.'
That's what happens when an utter prole becomes PMC and lets Aramark or Eurest take over.
I would just have ignored the Hackett-clad chav and rustled my paper in an irritated manner until he poked off to go and make sure that the 'may contain traces of nuts' signs were correctly displayed on the hotplate.
There seems to be some confusion over how much Angostura Bitters to put in. This recipe suggests a splash which is equal to a smidgen or the continental touche and corresponds to the exact number of drops required to fill a thingee up to the ish mark.