Seriously you honestly think it;s easier to tell the proportionate amount of alcohol from 16.5ml in 330ml.
Than just 5%...
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Yes you'll be surprised how many people can't work out percentages and as such have no idea how much alcohol is in a drink.
You can compare now with the units system.
But it means little, or that's 1 unit this is 2 units. Oh I've drunken 10ml is a lot easier to compare, add up and for people to understand.