Hornby did a 153 and 156 in Northern Rail livery, but I suspect the same situation apples there, and are about to release a 142 (too late for you though). Bachmann are set to release a 150, but again this is too late for you. Real Track Models may have released their 2-car 144 model (about £110), they might allow collection, but may have to send special delivery.
The Northern Rail 142 has been out for a while now, probably the best part of 2 years....
Oh really? I'm sure it said 'preorder' last time I was on the Hattons website (I don't often look for OO gauge stock), ah well, I can't be right all the time.
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What you might have seen was this?
I think the Northern Rail 142 was one of the 2012 range releases, although I seem to remember it being in Modelzone around winter 2011.