From next month looking at the Eastern & ASW sites it appears that a Dash 8 will be based in Aberdeen to operate the morning ABZ-LBA-BRS-PLH with another one operating in the opposite direction from PLH. They go back the other way in the evening.
The NQY-BRS-MAN could operate on a Saab (or a J41 if loads permit.)
So that would suggest that 2 Dash 8s could support the PLH programme. Might get interesting if they have any tech problems though!