Yes, thank you, Corifeo -- a very useful link -- and to you, ClassicRocker, for the advice. The figures on the website compare pretty closely with my Omron pedometer so, from now on, I'm entering my jogs as an 'Other' exercise. That way, I can put in much more accurate figures for calories burned. I thought my calorie deficits looked a bit excessive and now I understand why!
"There's no secret. You train a lot and eat right" (Mo Farah, British Olympic marathon runner).