Hi it’s Will thanks that’s great I have replaced the long belt and was lead to believe that the other one had been recently replaced but the engine is a far forward as it will go and it still slips in high transport speed.I wonder if its the wrong belt. I might replace it with a new one as per your numbers. I was planning on working on it on Tuesday but there was a fire in the field behind my house and we had to be evacuated . Everything is fine so will have a look another day.
Best wishes William