Interesting replies so far - thanks.
Things I'd personally like to pick up on ;
* Noel saying that cycling seems to be helping. Personally, I've always been a runner / biker, but this last 4 years I've switched more to MTB (up to 24h) but to get faster I've joined 2 local road clubs and yes, it has been painful at first but it is reaping massive rewards. I go out on weekly 2h club chaingangs. Legs come back battered, but not tired (if that makes sense?). When I wak up the next morning after I've been running, I know about it. After 2h insanely hard biking - I don't really. Somehow these 2h sessions are improving my quads and that seems to translate very very well to fell running but climbing and descending in particular.
*ba-ba comments on training on your own and lack of motivation (or words to that effect). I've always trained on my own, but increasingly I'm training with others. No - not to have a chinwag or so they can lead a route, but so that we can both / all push each other when we wouldn't otherwise. My local road club Belper Harriers is proving invaluable here and for the basis of my 2h Thursday sessions. (2 * 1hr run with fresh people coming out for the second hour).
* Karen's comment of "you get out what you put in" (or words to that effect) reflect what I'm personally finding - quality over quantity I think really in my recent training.