Ministerial resignations (often over Brexit) became so commonplace in the past couple of years you could be forgiven for starting to think they were not that big a deal.

But ministers run government departments – and regular changes of direction are challenging, according to Lord O’Donnell, who was cabinet secretary, the head of the civil service, between 2005 and 2011.

“When David Cameron asked me in 2010 what he could do for me, I told him my number-one priority would be to keep ministers in post for as long as possible,” he told BBC Reality Check.

To see why he was concerned, we looked back at how many people had held cabinet posts since 1997 – we decided to look at the jobs of all the ministers

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