From personal experience in T4 2 weeks ago I waited in excess of 45 minutes after a BA ground staff member had taken me to the front of the landside queue due only 50 mins to departure. From there it took 45 mins due only 2 machines in operation. I remonstrated with the security Duty manager who had no idea of the length of the queue's landside and agreed that only 2 machines was disgraceful?
Last week all X-ray machines working but not enough walkthrough scanners and queue was 20 minutes.
The BAA obviously has a problem managing their security and should get their finger out now!!!