The time measured was from arriving at the baggage carousel to the bags coming through. I does not stipulate any time to get from your seat on the plane to the baggage carousel - walking time from the aircraft to passport control, queue time at UK Border Control and walking distance the last bit to the baggage carousel. With long UK Border Control queues, the bag may already have been on the belt a long time at the time you arrive. Airports with awfull border queues and long walking distances may end as the best airport in this "research" - and that is maybe the reason why MAN is so high up on the list?