You want to be accurate in your interview so I've corrected the some info in the above post:
There's not one but two links although both sign the same work.
Blackburn have never signed to Kirby but already have Southport on the card although, apart from Sundays, this work went in December. I also don't think there's any Blackpool North work left although they still sign it.
Most of the work is Clitheroe to Rochdale and the triangle of Colne, Ormskirk and South. There's some work to Manchester via Todmorden. All in all, still quite a limited route card.
Any future additions is all just rumour with nothing set it stone. Leeds has been suggested since the depot opened but AFAIK there's nothing in the pipeline.
I think the earliest book on is around 0430 and latest finish is around 0045.
Finally, I've never heard of the depot being referred to as the 'Penthouse' and certainly wouldn't refer to it as that at your interview! It's a very nice depot though and Blackburn crew are very fortunate to have it which has led to some green eyed monsters elsewhere!
Traction is 142, 150/1+2, 153, 156 and 158.
Good luck in your interview. Make sure you have background info re Arriva and Northern (no harm in clarifying what is currently going on with the franchise during your interview).