Hi TBM, sorry for being a bit cryptic. I just wondered if, with a bit more electrical energy going through the high tension leads, the insulation might be breaking down. Lift the bonnet with the engine running in the dark and sparks are visible as the leads short out.
ah get it! No, the leads aren't arcing - they're fairly new Magnecor.
Set the points gap properly yesterday, and reset the timing and she's now purring like a kitten
