RE: AMM 753
I live near BHX myself and I can confirm Air 2000 does not have any 757-300’s in their fleet yet. I think the a/c type in your movements timetable is a misprint and should read 752.
I know another airline, JMC, has ordered the 757-300 and no doubt we will see those aircraft fly from BHX when they have entered service.
I doubt Air 2000 will be ordering the 753, their latest new aircraft orders comprise mainly of A320 series aircraft and I know some of these will replace the older 757’s in the fleet.