20mg in 100ml is the same as the .02% THE US has. In the US it means you can't complete your flight and have to deal with the company because FAA has a .04% limit which is their standard for alcohol abuse. .04% is the legal limit.
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All pilots have to very careful in the following months because what was ok for the last decade or more isn't ok now. We all loved those hot tub parties with the FA's so hope this doesn't diminish this wonderful career one step lower.
I loved those parties. What is flying going to be without them. Borrrrring.
Unfortunately in the UK and Australia now at .02% you have violated the law and could go to jail. You could drink for another hour and still drive though. That will probably change soon too.