Its a funny old World you know. Back in 2010, Cadbury was forced to removed the famous phrase "glass and a half" from its Dairy Milk bars as a well loved and recognised phrase that had been in use since 1930!
The phrase was originally used to explain the amount of milk in every half-pound chocolate bar. It has had to be amended to now read: "The equivalent of 426ml of fresh liquid milk in every 227g of milk chocolate". Trading Standards said it had no objections to the old phrase, and that Cadbury could continue using it.
But the EU enforced the stance that within the EU, because EU regulations state that by 2010 all weights and measures on packs MUST be in metric, SI units. Cue an expressive Eurocrat shoulder shrug and "Zees ees not SI metreec! my leel Ros-bif!'.
Of course things were better before Brexit as this advertisement from 1965 by Semiconductors Ltd. - a division of Plessey which shows they used the "Glass & A Half phraseology and couldn't be penalised either by Europoodles, because we were not in the EU and not by Cadbury's either we presume because the phrase wasn't a registered trademark...