Thanks for all the replies guys...I still think that the oil was overfilled from when I bought it, cos although it's on a paddock stand, the path the bike stands on is on a slope...so when it's on the stand the bike is actually on the level. I'll start it up tomorrow and see if the overflow happens again now that the tiny bit of overfilling the header tank caused it to spit coolant out. I will try whipping the spark plugs out as well to see if there is water getting into the bores.
One thing i do know is that if it is a head gasket the oilway bit of it hasn't blown because there was no water in the oil and there is no oil in the water.
Plenty of time to sort it...the 888 goes on SORN for the winter next week and the ST comes out to play
Jools
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