Mr Clarke volunteered for Bomber Command in 1940, and was accepted as a wireless operator and air gunner.

BBC: Sheffield & South Yorkshire

The nationally accepted practice is that you only take command (as chief) if there's something going wrong or if you can strengthen the command position or if it's overwhelming for the incident commander, and none of those things were in fact happening.

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"The nationally accepted practice is that you only take command (as chief) if there's something going wrong or if you can strengthen the command position or if it's overwhelming for the incident commander, and none of those things were in fact happening, " he told the paper.

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