The problem was all the FlyBe Dash 8 and a couple of Stobart ATR's were holding low i.e. below FL100 and the RVR's were up and down.
The true Cat 3 aircraft came in high i.e over FL100 and it was an ATC nightmare trying to get them down hence a couple went to Manchester (MON & RYR)
B-KQZ Cathay in BHX this morning - nice !