A Tech aircraft on IOM I understand but the an aircraft from Manchester did the BE 7347 late and then the last IOM BE 7348 left at 20:00 arriving Manchester 20:45ish
So a tech aircraft in IOM and a Manchester aircraft back in Manchester and the decision to bin the BE 7349 when the passengers were at the gate 20:20.
Therefore the decison to cancel the 7349 could have been made earlier as there was no intention of using the Manchester aircraft to op the 7349 and dead leg it out in the morning.
If it was crew hours at Manchester then the IOM crew from the tech aircraft could have positioned over on the 7348.