Right, this is going to be tricky for me to describe because I happened upon it by accident. We were in the zoo that is that middle round bar, and I needed the toilet so I headed off towards where the windows are out onto the runway, and went right around the corner towards the toilets. The Nook was on the left hand side, with seats in the window and a really nice looking bar, and I would say it's almost directly opposite the toilets or a little bit further back towards the main bar. It was tucked out of the way but I was so glad to find it!

If you were able to find out if it's reopened that would be very kind, thank you.

EDITED TO ADD: MAN Airport have just replied to my tweet. They said it has reopened and opening times vary by day. Thank you for offering to check