51. Making of contracts through presidential election agent.
(1) A contract (including a contract of employment and whether in writing or otherwise) by which any election expenses exceeding £500 in value are incurred by or on behalf of a candidate at a presidential election shall be made by the presidential election agent of the candidate and shall not be enforceable against the said candidate or presidential election agent unless so made.
(2) Nothing in this section shall prejudice the right of any person who is a party to a contract to recover from any other such person any moneys, property, goods or services due to the first-mentioned person on foot of such contract.