Anya, it may seem ridiculous but that is the rule. It safeguards the candidate from allegations of bribery - those who follow it to the letter. As I am sure you know the reason why limits are put on is that the very rich cannot buy their way in as they did in the past.
In some occupations you cannot be an active member of a political party, although you can be a member. I found this out recently when my daughter applied for a position for a Local Authority. The form stated that this post had political restrictions on it. When we looked it up, if appointed, she would no longer have been able to deliver leaflets, canvass, run a Committee room, take up positions in her local party etc - anything that brought her into contact with the general public where she could influence the outcome of anything with a political connection for a particular party.
I agree that some of these restrictions seem petty in the light of modern life but they safeguard the electorate from bribery and corruption and the candidates from such allegations. They also make for a more level playing field. Heaven forbid we go down the route adopted by other countries where money is 'God'.
Men writing from a female pov, and vice versa 📚
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