I always understood that Channel's 1-11s were acquired primarily to operate the Southend to Glasgow 'bus stop' route, because of it's ability to be self sufficient, needing very little ground support at airports en-route, allowing short on ground times.
However, the route never lived up to aspirations and the 1-11s were quickly replaced by Viscounts and then by HS748s before being withdrawn as a glorious failure!
Perhaps we should be discussing this further on the History and Nostalgia forum.