I would take the CAA stuff with a very, very large pinch of salt. The CAA has no independant way of establishing this data. It is entirely dependant on vested interests when it assembles the data. It has no means of even auditing the data!!!
For instance, when Thiefrow was reporting 30 mins queues for Security, and we were all experiencing 90-120 minutes or longer queues, it came in to the public domain that the CAA allowed Thiefrow to "average out" the queues over the full 24 hours. Er, from about 10.00 to 0500 the queues are Zero.