Among HMS Queen Elizabeth’s vital statistics, Ian Jack mentions the use of Windows XP (Britain’s new aircraft carrier may be a vast folly – but it still provokes awe, 1 July). The Ministry of Defence denied in December 2015 that it would be used once the vessel is operational, but appears not to have informed defence secretary Michael Fallon, who during his 27 June interview on BBC Radio 4’s Today programme seemed unable to confirm or deny its use.

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