Well I filled the disco up today with 40 litres of new oil, 10 litres or so of diesel all ready in it and added 150ml of mineral two stroke oil.
Man what a bloody difference. The motor slowly got smoother and more responsive over the first 8 miles and it was a wonderful drive. She isn't smoking as much either. I would thoroughly recommend the two stroke trick, so much so that I ageing to keep it quiet. Lol