Schedules -VS005/6

Evening folks 
I have noted that at the end of the month VS are changing the schedules of some flights (possibly several, though he MIA working caught my eye and was wondering if anyone could shed any light on the changes.
At the moment, the rotation departs LHR @ 1150 arriving @ MIA at 1620, returning at 2045 and landing after an overnight job at 1020. After the schedule move around this changes to dep LHR 1230 and arr MIA 1815, returning at 2055, flying over night touching down @ LHR 0925, taking an hour and 10 mins more, and 50 minutes less respectively. Why oh why? HELP! :/
Many thanks in advance, cheers
AJ


I have noted that at the end of the month VS are changing the schedules of some flights (possibly several, though he MIA working caught my eye and was wondering if anyone could shed any light on the changes.
At the moment, the rotation departs LHR @ 1150 arriving @ MIA at 1620, returning at 2045 and landing after an overnight job at 1020. After the schedule move around this changes to dep LHR 1230 and arr MIA 1815, returning at 2055, flying over night touching down @ LHR 0925, taking an hour and 10 mins more, and 50 minutes less respectively. Why oh why? HELP! :/
Many thanks in advance, cheers
AJ


