I am beginning to think that my ideal weight is 12 and half stone. Early this year I dropped it to 12 stone and lost the little speed I had. I have pushed it back up to 12st 5lb and I seemed to be faster. Losing weight did NOT translate into faster times for me, just the opposite.
ceal, It sounds like your singing is tough and out in the elements. Maybe you could start up a run/sing group where you run and sing at the same time, something a bit different. You would have to time the hills carefully.
Columba, A 2 hour run is tough no matter what your pace, you should feel very pleased with that. I am not sure my legs would stay fluid for that long, a big well done. I think as you improve your endurance base you will be able to push that bit harder and take your HR up a notch. I have noticed that as soon as I back off on my training intensity I seem to lose the ability to get my HR into the red zone. It takes a while to get it back again.
A very relaxed 10.6k for me today, 9:30 per mile, a truly beautiful day for running and riding a motorbike.