My answer is....a bit of scrap from something...

I had a closer inspection of the belt this morning Gibbo and I think it is the right way because the inside is a 3 ridge 4 valley grooved belt. I cannot think of anything I have that would have such a small drive belt although I have remembered buying a spares pack for the food mixer years ago. It may have been out of that pack as it turned out the motor was wrecked with a bent shaft so I dumped it without any work!Gibbo2286 wrote: 17 Mar 2025, 17:57 The belt's inside out but I'd guess it's a repair kit for a mower.
Think that's possible, or else something for turning a tensioner.