Ltr of Apple juice, and a pepper and ham salad in that white sauce stuff today. Through without a word.
The issue is that every aircraft that arrives in the UK the crew will be able to take what ever fluids they like on. And they will be able to interact with ground handlers and do aircraft swaps etc.
Its only UK pilots boarding that have these restrictions. And there is nothing stopping them going ground side then clearing security with fluids once they are away.
So it's completely pointless.