No it isn't. There was a petition to make it a specific offence ( https://petition.parliament.uk/petitions/200372 https://petition.parliament.uk/petitions/200

No it isn't. There was a petition to make it a specific offence ( https://petition.parliament.uk/petitions/200372 https://petition.parliament.uk/petitions/200372 ). However, the Government responded by pointing out that one of the seven principles of public life is "Holders of public office should be truthful." There don't appear to be any legal consequences for not upholding that or any of the other six principles. There is an offence of Misconduct in Public Office ( https://www.cps.gov.uk/legal-guidance/misconduct-public-office https://www.cps.gov.uk/legal-guidance/misconduct-public-offi... ), in which dishonesty is mentioned, but only in the context of fraud and similar behaviour.