Yes to the full blown 13hp - it has 'lectric start!.
I'd run it on Veggie oil - it's like being surrounded by fried chips smell. Ran my LandRover on sunflower oil for a while - smelled like a Chip Shop or Churro stand. I kept thinking of Bacon Butties too.
Most of the roads I ride/drive when I'm in the UK are pretty much unsuited to anything above a 500cc - Very narrow and twisty with masses of blind bends and poor surface. And the bits that are better are heavily policed: as that's where folk can speed - so many do. Even my 1979 Guzzi is on the big side. With it's MASSIVE 65rwbhp. I grew up there - know the roads and the R3 is so far out of it's element it's not funny.
And I do like diesels. They're the next best thing to steam.
@idk runs a "Curry Burner" Enfield as well as his R3.
The thing is to appreciate it it for what it is. A lovely old plodder - plod along looking at the fields. With 1000miles per tank.