Thanks for all the reply's.
From what I can gather from all this info.
Seems that it was detonating to the point that the spark plug tip came off and got smashed into the cylinder head.
And melted and all bad things happened from there.
I'm unsure about the cylinder condition I've emailed Matt for his expert photo judging skills.
Then I gotta get all the tools to open it up. (a first time for me).
Before I do the rebuild i'll definately become a supporter of the site.
Just gotta purchase all the bits and bobs.
Hopefully I can have some more success.
But I definately learn from my mistakes.
I'll keep you al updated with how its all going.
Thanks again
Chris