I possibly think the Volvo B5LH's will stay on the Angel 21, people saying about getting a upgrade because of the amount of spares currently appearing on the 21 (plus 3962/3965 being branded) but this has been the case pretty much since the Hybrids entered service due to the timetable being changed for reliability reasons I think? whatever the reason was, more resources were required and somehow I can't see things changing. This is just a theory I have.
I can't see the 27 getting the Volvo B5LH's, in my opinion at least, I don't think the 27 really needs the extra capacity, the only way I can see them going on the 27 is if they drop the frequency from 12 minutes to 15 minute operation.
Go North East: 2016/17 Financial Year Order Predictions