It was in most ways still a Tory government in 2000 under Blair. However in fact the legislation concerned was introduced in 1989, under Thatcher, but with a delay in enforcing it built in.
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"...we all know exactly what a pint looks like" - but of course so do the Americans, and if you got one of their pints you'd complain, and you'd be right to do so. (I'm talking about the size of the glass, not trolling about the quality of the contents!)