Dave-

Did a compression test and seems fine thankfully.

Ok - still the same - nearly melted the starter as cranking so much it got very hot so have left it for now although might have knackered it. - what about oil and fuel mixing...

lots of smoke when it does eventually catch - overfuelling though - and runs rough and only just idles.. better when mid revs. plugs wet and black ....

crank sensor, water temp sensor, and map sensor then as you said earlier... ?