Looking at the timetable on bustimes.org for the AirCoach service it looks like the PVR is 3 minibuses will be used with the other one acting as a spare?
The timings seem a bit tight to me just over 70 mins each way.
Timetable: https://bustimes.org/services/aircoach-leicester-st-margarets-bus-station-birmin
The timings seem a bit tight to me just over 70 mins each way.
Timetable: https://bustimes.org/services/aircoach-leicester-st-margarets-bus-station-birmin