Admirals club is there and remains open for BA departures even if they go out a little late. I have twice benefited from BA being late and been able to use the Admirals before the 23.45 departure to new York on AA.
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The lounge is decent enough..offers a variety of tapas style foods and plenty of healthy options. Well stocked bar with excellent tequilas and mescals. I can also recommend the coffee..