Apparently a glass and a half of whole milk in every half pound of chocolate is no longer politically correct. I mean who measured milk in glasses? From now on, Cadbury’s will advertise their Dairy Milk bar as containing the equivalent of 426ml of fresh liquid milk in every 227g of milk chocolate. Much clearer isn’t it? Catchy too.
Two litres of milk in every kilo.
Two decilitres in every hectogram.
A litre in every (metric) pound.
A (metric) pint in every (230g) bar.
The reason we can’t say “cup” in Britain is because it is ambiguous. Officially a cup is 284ml or half a pint, which is at odds with every other neighbouring country who define it as 250ml. If Britain ditched its ridiculous imperial measurements, it could start using the same standards for “cup” and “pound” (500g) that are used everywhere else and then saying things like “x cups in y pounds” would be unambiguous and perfectly politically correct.
The problem is, we are told only to use “mili”, “kilo”, and other power-of-1000 prefixes, which are not as friendly as the centi, deci, deka and hecto that they use in the rest of Europe, so metric is seen as being too fiddly, as your example “426ml of fresh liquid milk in every 227g of milk chocolate” demonstrates.