Make mine a 0.57 litre

Best of Both Worlds: So farewell then acre
The main bite of the EU restrictions is that outside of beer and the other exceptions, transactions can't be conducted exclusively in imperial measures, which explains why the traditionalists in the grocery trade are offended. Without a constituency to defend it, note that the acre is long gone. But there never was any risk that French Special Forces would be parachuting into the Stag's Head to force orders of "0.57 litre of Guinness."