Thanks Dave and Kaiser.
I'm not sure there was any gunk in the system, the cooling fluid was changed a few months ago when I got the car, the old stuff looked very clear and fresh.
I am assuming that it was overheating because the fan was us. Over a space of time it was probably venting and losing a little fluid each time.
With the decent weather I was not using the air con or demist much which meant the fan was hardly ever available.
On the fateful warm evening, I was up and down the steep hills several times, the coolant was getting lower and lower until I got the overheat warning.
That's the only explanation my fuddled mind can come up with.
Fingers crossed it will be ok now, but I'll obviously keep a more regular eye on fluid levels.
Phil
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