Thanks, folks. Claudication is what my GP put on the letter to the radiographer who gave me an ultrasound scan. Fascinating to see the blood actually moving through my arteries (She said it worked by using doppler effect: I asked.)
I have bloodflow clearly discernable -I could see it- all the way down to my ankles, but that was when I was lying down. I have no difficulty at all lying, standing, sitting, just walking and climbing hills or ladders, and even then not at first.
The GP could detect NO pulses in my legs, but I'm told that that is fairly common, as it is often difficult.

Yes, Bonecruncher, as I'm definately getting worse, I'm going back to the doc to see if I can ginger him up. However, a MRI scan would be very expensive, I imagine, as the ultrasound cost me a weeks wages.(Or would have done if I was still working.)

It's a bugger, getting old, eh?