I'm not signing. The different budgets (including health) are ring-fenced at high level, and the people in this country aren't going to die, just to be highly inconvenienced (and they do have my every sympathy).
Why target the overseas aid budget, rather than ministers' expenses or other unpopular overpayments? "Britons endure unimaginable hardship"? Good old DM -that's somewhat of an overstatement compared to the hardships, say, in Africa, where people are dying for lack of wells or food.