Originally Posted by
Geriaviator
Purely a guess but maybe lower landing/parking charges at Sywell could have been a factor as HP was on finals for its demise?
There was a plan to build Jetstreams at Sywell by Terravia and indeed they may (or may not) have completed a couple of airframes there (major components roaded up from Radlett),they then apparently moved to Leavesden as part of Scottish Aviation and eventually up to Prestwick.