Prime Minister Rishi Sunak’s cabinet reshuffle is the latest spin of an increasingly frenetic merry-go-round of the great offices of state since the Brexit referendum.

The churn rate of the four top positions in government has broadly tripled in the wake of the Brexit vote, compared with the period between 1979 and June 2016. Excluding incumbents at the time of the vote, there have been four prime ministers, six chancellors and foreign secretaries, and seven home secretaries since the referendum.

The average tenure for the positions of chancellor, foreign secretary and home secretary has fallen below 500 days since mid-2016. The constant churn in senior roles has stymied ministers’ ability to effectively master their brief and efficiently enact policies, according to some policy experts.