Yep, the Plaza Premium arrivals lounge sounds like the go. When you come through T1 security into the terminal it's way down the end to your left, very easy to miss. It's actually part of the Aerotel which is one reason it's so easily overlooked – you go to the Aerotel checkin desk, show your Priority Pass card or whatever, and they walk you down a corridor to the 'lounge'.

Just don't get your hopes up – it's nothing like most arrivals lounges, even the dedicated Plaza Premium arrivals lounges at LHR etc etc – the breakfast selection is very average, but if you just need a place to park yourself and your laptop, grab some coffee and a light breakfast, it'll do the job.