I saw two about-to-be-pax airside in GLA emptying two 500ml water bottles down the sink and refilling them from a litre bottle of duty-free vodka. About 05:00, as MrsP and I were heading for the gate for a flight at 06:00. No staff to be seen, and they'd buggad off before I could find anyone to warn. I felt sorry for the CC who'd have to deal with them.