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when I stopped the oil temp was at 120C (248F) and the pressure somewhere between 5-10psi,
that's a pretty normal oil pressure at idle as far as I know..
Happened to me Kev with the Daytona engine.
I've been on a lot of air-cooled motorcycles, in a lot of extreme conditions. I've never, not once, had an oil pressure light flicker because the oil has lost viscosity or "thinned" at temperature.
I guess that's what a woman friend thought when her R90 oil light came on about five miles from home. Almost made it too.
You're saying the oil lost viscosity and/or the oil thinned that much do to heat that it caused the light to flicker?
And in her case what happened?!?