My concern is that all 15 crew members were held so that must include the cockpit crew as there can only be about 12 in the back. I find it difficult to believe that the flight crew could have been involved
Even if it is true all 15 were arrested, it does not go on to say whether they were all detained in custody etc.
I suspect HMRC would arrest all to invoke certain powers / keep the crew separated / and gather enough evidence to decide who to detain and who to release etc. As above, it may well be that this was not a "chance" interception, but one customs team at the aircraft (?) and another intercepting the crew separately (e.g. on board / immigration). It could well take a bit of time to establish exactly who is who, whose bag is who's, particularly when it involves 3 bags so a "team" maybe working together...
NoD