Arrange a referendum to give the general public a vote on MPs second jobs. We believe MPs can’t make this decision themselves as it directly affects them, so they have conflicted interests. If the Government and Parliament believe in a democratic society they should trust the voting public on this.
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By allowing MPs to determine what if any rules to impose about 2nd jobs they could simply choose an outcome that is most advantageous to them as a group. MPs are well paid compared to the average UK worker and many other workers have clauses in their contracts that state that having a 2nd job isn’t allowed unless signed off by their manager or director. A 2nd job takes focus away from their current job and may result in a conflict of interest. Let the public decide.