... guys for your responses, luckliy the problem did not resurface today and I took the car for a 2 hour drive.

I must say it has been the hottest weather here in about 70 years this week (also very humid) so perhaps it's just the weather playing havoc with some of the sensors.

When I press the temp button while it's happening, it brings up the outside temp but doesn't stay flashing long enough as per usual.

Anyway, fingers crossed that it was just a one-off

The air con at least works fine even when it was happening.

Cheers,
Pete
http://www.mp3.com/petealec