It was indeed AM2 matting. I know because I made the bar floor out of it when we arrived on 18 October 1982. It was a good bar though a little short on beer. We tried to get some from Batemans with a promo picture but to no avail. And for all those who weren't there in Stanley days, this is how it was - ploughed field and wellys - not the usual front line aircrew deal.
Dave - if you want some gen on those days PM me.