Norky, you might be on hold for the Manchester Jobs, Northern seem to be doing a bit of cost cutting at the moment. a few have left for TPE/Gone Driving as well.
For the OP, another good site you can look at is:
http://www.freewebs.com/becomingaconductor/
They'll want to know your strengths and weaknesses, so emphasise something good about yourself and something(not too!)bad.
Just for information, Carlisle routes are:
Carlisle-Newcastle
Carlisle-Leeds(Settle/Carlisle)
And maybe Carlisle-Dumfries for route retention
Traction 142, 153, 156, 158