The Walking Man's Crumpet. Countryfile. Trekked More Than 3400 Miles. What Am I Talking about?

Dr David West, Consultant Interventional Radiologist who treats varicose veins at The Medical Chambers Kensington, has been busy treating "the walking man's crumpet"

I don't expect you to know what I mean but here's a couple of clues.  Countryfile.  Trekked more than 3400 miles.  You can learn more here.