Broadly speaking, anything under 125 years old from it's first date of issue would be under Crown Copyright.
But then again, if your reproducing items as fakes, would you even care that it violates one set of laws over another.
Until recently, it was purely a civil matter, though changes to IP rules last year have put it slightly more in the realm of being a criminal matter, but it's still one of actually enforcing those rights or if the effort is worth the time and cost to pursue.
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