Truss has pledged to raise defence spending to 3 per cent of GDP by 2030, while Sunak would keep it on its present path, rising to 2.5 per cent over the same period. Although the former chancellor gave the Ministry of Defence special treatment in his spending review, he shares the Treasury’s scepticism about getting value for money from it.

While the Truss camp suggests Sunak would be less supportive of Ukraine amid fears of the impact on the UK of sanctions against Russia, in practice they would probably adopt the same approach. However, Truss would probably be more hawkish than him towards China.