The entrance Danger was looking for was the one on the concourse. The Photo you posted is the internal entrance, same one that I took last Sunday, however the door was open so I also snapped the second photo from behind the frost glass. In the second photo the lounge police was just off to the right at the top end of the corridor on the right, the lounge is off to the left.
It is a nice little lounge, in fact I was somewhat surprised at how such a nice lounge is when compared to the main QP. As I mentioned (I think), last year I followed someone in thinking ADL had opened a business lounge, the door was open and on that day there was no internal lounge police so I just went in. My presence was caught via the internal cameras and after about 10 minutes the lounge staff came up to inform me of my transgression. I was allowed to stay and let off with a warning of don't do it again.