Ebay can be a marvellous thing sometimes...
Do you know what I managed to buy? at a very reasonable price?
Yes! Its a cylinder head! It has all it's fins intact, it is clean as a new pin, it has new valves & guides, all the threads are helicoiled, both surfaces have been skimmed and there are no cracks!
There is a god... and he lives in Bungay.
Thanks again Draganfly!