Dave,

Ran the engine up today, tried a different fuel (prosynth 2000 20%), and she idle's a treat, and didn't get hot at all. The midway transition seemed a bit lean, so I took you advice and opened the regulator adjustment a small amount. Now seems to be running ok (although ambient temperature was very low today). Will try again on a nice hot day. Will keep you posted!!!
Many thanks for your help.

Lee