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I don't know...if public opinion shifts to the extent a majority of MPs got on board I doubt the Lords would stand in the way.

Now Canada and a large portion of the US has legalised, and much more is becoming known about the plant and its relative safety & even benefits, I would think it's just a matter of time before some form of legalisation comes to Europe, and the UK. If we had the rates of use of US & Canada maybe it'd be happening already but there's less users and a more conservative view overall about it I'd say, so it'll take longer but it will happen
from  paddy420