Counting movements, and recording which runway they used, and why, is hardly rocket science. I don't believe for a moment that NATS aren't doing that part properly.
The
why can be missed sometimes, it depends on priorities at the time. Most
whys can be worked out afterwards, again if there is time, or purely from the stats.
However, the
benefit for each particular flight is very much more difficult to ascertain when looked at in isolation. Did the out of alternation arrival occur because of Ops Freedoms? Or would it have TEAMed anyway in a pre-Ops Freedoms world? If we 'Ops Freedoms' TEAMed 3 an hour over two hours, would we have 'standard' TEAMed 6 in the second hour before? Yes, it's probably better because it
implies less airborne holding, but is it looked at as 6 extra arrivals? Did the fact that we used some of the pro-active tests such as landing the A380 and T4 traffic on the departure runway cause a build up in departure delay?
Add all that to the common misconception that standard TEAM of 6 per hour gives you 6 extra arrivals per hour, and it all gets rather complicated!