NoD, you are correct.
Helicopter movements from the helipad near T4 are not counted (Only if they use the runway, which they are required to do at night), neither are helicopter crossers or as you say the police helos etc.
<All that on top of pretty shambolic work in progress and increasing restrictions making Ground Movement a nightmare for the controllers and pilots alike.>
Ahhh, is that your excuse, HH?
Gonzo.