I think what you are fishing after is;
http://www.caa.co.uk/docs/33/CAP393.pdf Sect 2 page 24
As this wasn't at night, nav lights need not be displayed and the anti col could well have been u/s.
As for operating under the descent slope, this happens even at large airfields.
I suspect the only 'incident' was the one the Police were dealing with that I suspect you simply want to know more about. Why not call them?