In Mr Federman's view, the quest for truth has given way to the quest for making sense of the world as experienced.

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But at least now, for the first time, virtually all of those involved say they will share their information in the quest for truth.

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But there is also humour in the quest for truth.

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When Mr Starr himself was defending tobacco companies some years ago, and signing briefs arguing that nicotine might not be addictive, he seemed to understand that the quest for truth must be balanced against the rights of defendants.

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But Mrs Williams' quest for the truth saw her track down witnesses, one of whom suggested Kevin uttered the word mum at around 16:00.

BBC: Anne Williams