“I would definitely try to stay away from those, because they can cause a lot of irritation for kids,” he said.

Most suffered from mild illness, including conjunctivitis, or pink eye, and upper respiratory irritation.

As the losing presidential candidate, Kamala Harris is not held in warm regard, and her continuing fundraising efforts have added to the irritation.

The symptoms, which included breathing difficulties, eye irritation and nosebleeds, were traced to high levels of formaldehyde.

But the prime minister's obvious irritation act has caused genuine upset in Whitehall.