Work on a business case for the 海角视频鈥檚 biggest combined authority has begun 鈥 but leaders have been told will be needed.

With , the West Midlands combined authority is set to oversee a region with of four million people and an 拢81 billion economy.

Leaders of the seven authorities, which also include , have pledged to 鈥済rasp the nettle鈥 and push for a 鈥渕ajor devolution deal鈥.

But with most of the leaders opposed to a region-wide mayor, they are set for a rough ride with government after it was spelled out as a prerequisite in the Queen鈥檚 speech.

The Queen said: 鈥淭o bring different parts of our country together, my Government will work to bring about a balanced economic recovery. Legislation will be introduced to provide for the devolution of powers to cities with elected metro mayors.鈥

Speaking on behalf of the West Midlands authorities exploring options for a combined authority, the leader of Sandwell Council councillor Darren Cooper, said: 鈥淭he Queen鈥檚 speech demonstrates that the government is prioritising devolution to cities, coming fast on the heels of major announcements about the Northern Powerhouse, the forthcoming Productivity Plan and the appointment of new ministers to drive this agenda.

鈥淔or our area this is a once-in-a-generation opportunity to move power from Whitehall to the West Midlands and have a much bigger say in making the key decisions that will drive economic growth in relation to transport, housing, regeneration and jobs. There is a real sense of urgency in the region and politicians are grasping the nettle to transform how our councils work together and to present a credible, ambitious and compelling business case to government.鈥

Coun Cooper said there was a clear plan that would see the councils work alongside residents, businesses and organisations with the aim of developing a prospectus, to be published in the summer.

The Queen鈥檚 speech came a day after the latest meeting of council leaders, who now have an agreement-in-principle.

If a combined authority brought together the three local enterprise partnership areas, that would mean it would cover a region with an 拢81 billion economy 鈥 dwarfing Greater Manchester, which is more like 拢54 billion. The name 鈥 with Greater Birmingham seen as unpopular outside the city 鈥 and metro mayor issue are likely to be sticking points. They are presently not being debated, with issues like skills, infrastructure and housing at the fore.

However, business leaders have urged civic bosses to bury parochialism for the greater good.

Johnathan Dudley, regional managing partner of national audit, tax and advisory firm Crowe Clark Whitehill, said: 鈥淭he force of economics and commercial pressure will take on local political fiefdoms in a battle where those that reform will take the winnings for themselves, leaving parochial authorities behind.鈥

Mike Dell, chairman of the Black Country Chamber of Commerce Devolution Group, said it was important business was at the heart of the agenda.

He said: 鈥淥ur members are in favour of a West Midlands approach and the news is one step further forward to achieving this.

鈥淲hether we like it or not we are competing with Greater Manchester and the Northern Powerhouse and the industrial heart of the 海角视频 needs the right political infrastructure to ensure we are able to manage our future effectively.

鈥淗owever, where we can make a real difference is through the engagement of business leaders. I understand the Government鈥檚 focus on elected mayors but without business leaders taking ownership of the skills and transport agenda, all we will end up with is a bureaucratic superstructure.鈥