Bluebird has too many ‘Coach’ profile vehicles anyway, often these unsuitable monstrosities appear on local services where access for pushchairs, walking aids and people with reduced mobility is poor and nonexistent.
In my view, any spare vehicles should be low floor wheelchair accessible service buses as, these can be used on any route without loss of access, where coaches just add to problem. Stagecoach seem to rely on buying unsuitable coaches to use on bus work though.
The trend seems to be to use low floor vehicles on some 10 & M96 workings anyway, so the coaches could easily be transferred away, replacing them with low floor vehicles would then solve any allocation issues.