There was another load of meaningless drivel out the other day. It is almost as if they are trying to outdo Global Airlines on the meaningless-drivel-to-disguise-no-action front.
If availability of ATR aircraft is a major issue - as I suspect it may be - then a change of start-up aircraft type may explain the delays. But an E175 will make even less sense on their initial EDI-MAN and SOU routes if so.