Hi Grumpy,
Oh Joy,
it sounds much like a Christmas Carol ! and the most likely scenario as the unit has sat around for quite a while. BTW the oil flushing went well as I got hold of 3 litres of soluble oil and it didn't take much at all as I left the motor overnight with the bottom plug out and leaning over so ever little bit came out and then ran 2 lots of SO through it. Second lot came out as good as it went in. After a good draining I've filled it up with SAE 30 and it sounds and runs great apart from the hunting.
Cheers,
BB
PS. I'll post this result up on the other thread so that there's a result showing.