I recall at LHR when I was with BMA (around 1981?) that the BAF painted demo 146 G-OBAF came in and was iirc being shown off to Brymon whom we handled there for the NQY and PLH flghts (who then ordered Dash 7's)
Then at LGW we often saw Dan Air 146's go off on quite long IT charter flights CFU AGP and FAO (but I think a tech stop was needed)
Manx used their -100 on weekend ski flights but you could not get all the pax's ski's and boots in the holds and we had to lave some behind and put them on the 757 lol