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It's incredibly ineffective, or people wouldn't be asking so many questions about it on this thread.

One shot is one centilitre.

One beer is 2-3 centilitres.

One glass of wine is 2-3 centilitres.

It's not maths at all, it's just communication. There's nothing "simpler" about "unit" than "centilitre", it's just less clear.

People asking questions are being obtuse and also clearly aren't in the UK where this legislation is aimed.

It would be like a continental European going to America and going, "What are all these MILES things? It's confusing!".

I'm an American, and miles are confusing.