Can I purchase screw top bottle of wine at duty free shop at Heathrow. Dry flight assume no corkscews allowed?

Answer 1

Most airlines will not allow you to drink your own wine on a flight. It's a liability issue--- if they are serving you the alcohol, they can cut you off if you get intoxicated. If you are serving yourself, they have no real way to keep you from drinking too much. And the airlines do not want you to drink so much that you either become disruptive/belligerant, or are a liability in an emergency (in other words, if you are too drunk, you can't evacuate and will need someone to help you out--- and the airlines do NOT want you getting that wasted!).