You were spot on in your diagnosis, I was thrown a bit by the comp test results I must say but when all is said and done at the original point in time I didn't have the funds or other transport available to pull it off the road and tear it down to have a look. :roll: It is testament to how strong these little 4 pots are though, that's been running with a duff valve for yonks now. The date of the last topic mentioned was july last year and this problem had been noticed by me about a year before that so full marks to the little Rover, she did well