Sticking a postage stamp on an envelope upside down is considered treason.
If a postage stamp shows the head of the queen, which they all do, it is considered treason.
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It is illegal for taxi drivers to carry rabid dogs or corpses.
This is part of the Public Health (Control of Disease) Act 1984, sections 33 and 34: Public Conveyances. An interesting discussion regarding this law (and a few others) can be found here.
Women are permitted to go topless in Liverpool provided they work as a clerk in a shop selling tropical fish.
Urban legend? No one on the Liverpool City Council will give credence to a law along these lines. Seems like there must have been a story behind this one…
It is illegal to eat mince pies on December 25.
This decree from Oliver Cromwell in 1644 was meant to combat gluttony. You’re all criminals!