Duty free from Orlando

Hi folks, I'm flying home tomorrow MCO-LGW-DUB my question is :- if I purchase duty free alcohol in Orlando will it be taken from me in Gatwick even if we are just passing through flight connections to Dublin? Really don't want to come home though

If it is in a sealed, clear Duty Free bag with the receipt clearly visible, and you are using Flight Transfers (not exiting to re-check bags, then re-entering), then all should be ok.