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Parliament will debate petition: Make lying in the House of Commons a criminal offence - 23rd October 2023
(petition.parliament.uk)
Main community for the Feddit UK instance
It already is... in a way.
It is against the rules of both houses to knowingly mislead the house, and Parliament is free to punish its members up to and including imprisoning them (until dissolution, anyway).
Well that's the point of this, if they make it a crime then they shouldn't be able to get away with doing it.