Waggled the wires - it remained dead. Popped the windscreen screen out 1/2 way to get easy access to the back of the panel & checked the instrument with a resistance meter to show continuity.
The in line connectors and the rear of the panel were exposed unplugged and reconnected but no change. Lighting a flame under the thermo-couple probe which I'd pulled out of the exhaust pipe position gave no reading. Likewise checking the resistance of the probe from its leads shows open circuit. 
Conrad Beale confirmed it self powers the gauge & should read about 1 ohm, so ordered a new one. Easily refitted & reads nicely again.
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