In reply to all:
Cheers all. I have an older one which I guess I bought when I was last living in Northern England, so late 90s I suppose and that is noticeably thinner than the 2006 one, so I figured plenty of stuff got done between those two editions. You can read the intro to the 2012 one on Amazon's look inside feature and the editor notes there were some good winters between the two editions meaning new routes - but I was sort of hoping most were the controversial superhard mixed lines that will be too hard for me.
It's interesting that they still have one of the few winter routes I've done in the Lakes - Left Hand Route on Cambridge Crag - as 80 mtrs. Maybe I'm just going mad with old age but I'm certain we did three good pitches on that climb, so I'm sure it must be more like 110 or 120 metres. Might need to go and do one of the other routes on that crag this winter to see if it has shrunk since I was last there!