His flight was held in a 45minute queue at 6am yesterday? I presume that was his inbound from the CHOGM meeting in Oz? That being so are you referring to a queue on the ground or a hold in the air?. .. .Queue on the ground could be due to shortage of gates / ramp space although since he flies BA and is the PM you think that there would be some priority allocated to him!!. .. .Hold in the air at 6am would seem odd, I thought that Heathrow is relatively queit at that time?. .. .The NATS protest idea is "interesting" but I think implausible. To have him stuck in a queue NATS would have to have held up all the others in the queue as well. That would require a concerted effort from more than one controller plus a supervisor. Also the various Ops Desks of each affected airline would be on the phone to NATS quicker that you can imagine.