He blamed the decision on “ill-conceived legislation” – the Cities and Local Government Devolution Act. This act contains a sunset clause, which expires next March, permitting the secretary of state to fast track structural and boundary changes with the consent of only one local authority.

Brokenshire said that “the great majority” of local public sector partners backed the plans including the police, ambulance service, clinical commissioning group and NHS trusts.

He also said it would improve local government and establish a “credible geography”, thus meeting the criteria needed for structural change.

Brokenshire did acknowledge there were concerns that a single unitary might weaken democratic engagement at the most local level.

“To help reassure any who might be concerned on this, I intend to speak with five councils to determine whether I should modify the proposal before implementing it,” he said.

Martin Tett, leader of Buckinghamshire County Council, hailed the decision as “historic” and called for unity among local leaders.

“The announcement paves the way for a brand new council, fit for the future, created by combining the best of both county and district councils,” he said.

“This new council will be simpler, better value and more local to our residents. It will also have more clout to face head-on the great strategic challenges facing the county over the coming decades.”