Politics Home has a story on government plans to re-introduce imperial measures - I think on an optional basis. Perhaps this is compensation to enthusiastic Brexiteers who are disappointed not to have had the bonfire of EU law (and total legal chaos): https://www.politicshome.com/news/article/post-brexit-imperial-measurements-drive-revived
Post-Brexit Push For Imperial Measurements Could Be Revived

Ministers are considering reviving plans to bring back imperial measurements as part of the legislative agenda to be set out in the King's Speech t...

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@LornaWoods Why on Earth would the retail industry go to the bother and expense of recalibrating or replacing weighing equipment and procedures for this nonsense. This will excite a few idiot gammonati, whilst the actual industries it affects will say ‘Nah thanks, we’re fine as we are’.
@markslater @LornaWoods there’s a ‘simple’ (probably not) solution to this. Introduce a new weights and measure act and define a pint as 500ml, a pound as 500g, and so on. Sorted!
It’s not uncommon in places in Europe for a loaf of bread (nominally about 500g) to be a ‘one-pounder’ (using Pfund, livre, Pond, etc), so I’m sure the UK could adapt.
(OK, probably not.)
@themomage @LornaWoods Thing is, a pint isn’t 500ml, so for any of this to actually be precise in actual weights and measures (if somewhat woolly in language), would still require all the glasses, bottles, containers, labelling, signage etc to be reviewed and likely replaced at great effort and expense. I think this proposed legislation is simply to allow imperial measures, so the simplest solution is to ignore the idiots and just carry on as you are.