Many thanks to all who replied with suggestions about what might be causing the problem. Overheating would seem a logical cause but other graphic intensive games i.e. flightsim work perfectly. Also the fan seems to be working fine. I have decided the problem needs to be sorted out in computer dry dock by someone who enjoys playing with computers rather than computer games.
Hope they fix it quickly before I'm forced to start talking to the wife again....
Nice to be part of the community
Chris
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