In a statement issued on his behalf last week by the stable, Al Zarooni said he had made a "catastrophic error" in administering the drugs.

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"This catastrophic error of judgment - hiring Andy Coulson, hanging on to him too long - directly contributed to the position Sir Paul found himself in and his decision to resign, " said Mr Miliband.

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Several years ago, I myself was the victim of a pharmacy error that could have had catastrophic consequences.

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Just as al Qaeda and its allies are constantly evolving and adapting their efforts to strike us, we have to constantly adapt and evolve to defeat them, because as we saw on Christmas, the margin for error is slim and the consequences of failure can be catastrophic.

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