Sorted !!
Well....Looks like it's sorted.
After a lengthy check the dealer still thought it was a head gasket so replaced them. Apparently this is not a common fault - the only time the mechanic has seen this problem, but they said as soon as they opened it up they saw where the gasket had been passing into the cooling system. It had been pressurising the cooling a little and would have increased as the temp rose.
Picked the bike up and let it tick over till hot - no problems.
Had a great run up the coast road - temp didn't rise above 80 even through towns.
Let it idle once I got home. Fans kicked in at 102 and 103 and cooled engine back down to 100 several times.
Hopefully that's it - no more problems. If i do have any more cooling problems I'll bear in mind all your advice in the previous threads - my thanks to you all for your advice and help.
Cheers!!
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