Cheers mate, thanks for the link.
The oil or gunge I can see around the spark plug as you look down the hole, I have not removed them yet! Just want to know if any of the gunge falls down the hole when I remove the plug will cause any damage.
If it does have oil around the base of plugs
and it is one of the two thing you mentioned:
1. Worn piston rings
2. rocker cover gasket needing changed
Could this be the cause of my smoking? as I have done an oil and filter cahnge and she is still smoking when hot

Also are therw any how to's on replacing the Worn piston rings or rocker cover gasket ?