Which British passive-aggressive phrase actually stings the most when someone uses it on you?

The verbal equivalent of loading a gun before pulling the trigger. Everyone knows nothing respectful is about to follow.

Six words that mean: 'I already told you this, you absolute muppet, and now I have receipts.' Usually cc'd to your manager.

Sounds sweet until you realise it's usually reserved for the terminally clueless. Often deployed by nans and Karens alike.

Whether it's your outfit, your wallpaper or your dinner order, this phrase confirms everyone at the table is judging you.

The classic British lie delivered through gritted teeth. You will hear about this specific incident at every family gathering for the next decade.