Thanks, I am learning to control the feed rate.
I will go back and check tyre cleanliness and blade and guides are clean too.
It was my misguided expectation of the cut I thought I'd get.
So now with a good setup, correct tensioning, good blade and me getting better at using the saw, I'm getting better cuts.

A case of an 'old dog learning new tricks'.....
Thanks for all the help.
Lyle