Cheers for all the input! My feeling, despite some views here, is that it really was worthwhile. I enjoyed it and it was a run I wouldnt/couldnt have got in otherwise. Just for information, and to clarify, I only manage a couple of runs a week at present, I just turned 50 and have been running over 30 years. There certainly is a bit of horses-for-courses I guess, but I tend to think as I'm basically looking, at present, to improve/maintain my basic 'endurance' it did a job. I do also do occasional timed runs over 3 mile to work a little on speed, none of which is very scientific I know but I'm fairly sure that every little helps!