Security never bother. As they are only 50ml, you can take them on. I once took about 12 in my wee plastic bag, and the security guy thought it was hilarious, and good planning !
What Glasgowboyherts says is correct. You are not allowed to drink alcohol on a flight, unless purchased on said flight, but if you are discreet and not a fud, you can usually manage a quiet scoop.