Steve Gay: Well, without knowing the precise circumstances of that particular job I would expect the engineer to do the checks that he would normally do, but essentially would isolate the system if there was suspicion of carbon monoxide, and advise the consumer to have the appliances tested and checked by a Corgi-registered installer.

BBC: Frontline Scotland graphic

Buchholz, a physicist and a nuclear engineer, is an expert at something called accelerator mass spectrometry, an extraordinarily precise method of determining the chemical composition of materials.

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