YORKSHIRE could get a £600m cash boost from London hosting the 2012 Olympic Games, it is claimed.
And Britain must produce a team effort to win the Olympics, Culture Secretary Tessa Jowell said today.
Inspectors from the International Olympic Committee (IOC) arrive in London tomorrow to inspect the city's bid to host the Games.
But Ms Jowell is taking the campaign to the Midlands today with the message that victory will bring benefits to the whole country.
A report into the regional economic benefits of London hosting the Games suggests that Kirklees's share could exceed £5.75m.
The claim comes from the region's Olympic Steering Group. Its figures are based on statistics from the successful 2000 Sydney Olympics and based on the assumption that about 2,500 athletes and officials are based in Yorkshire for pre-Olympic preparation and training camps.
The report said the region could potentially benefit for four years before the Games open - bringing monthly revenue of about £13.4m.
The Olympic Steering Group was set up in July last year by senior officials from regional development agency Yorkshire Forward, the Yorkshire Tourist Board, Sport England and Sheffield International Venues Ltd.
It aims to lead Yorkshire's support for the London bid and encourage people in the region to back it actively.
It is also working on ways to promote Yorkshire as a venue for future major international events.
Don Stewart, a director at Yorkshire Forward, said: "A successful national bid for the Games will not just benefit the capital. The regions could also enjoy significant economic, business and tourism boosts.
"Throughout the month-long Games, more than 400 new jobs would be created in Leeds alone to cater for extra staff required at training venues, supply chains and hotels."
Mr Stewart said the figures were based on an estimated 2,500 people coming to Yorkshire - but that the final figure could be higher.
"It is important that people in the region realise how they could benefit from the Games as improved facilities will encourage healthier and more active communities," he said.
"The impact of the 2012 Olympics could be huge, so we urge everyone to get behind the bid."
David Andrews, chief executive of Yorkshire Tourist Board, said: "Yorkshire has fantastic training facilities, which could draw the biggest national teams to train in the region.
"That would create huge spin-offs for tourism - with supporters following their country's competitors and, no doubt, visiting the numerous cultural attractions we can offer."
Mr Andrews said having the Chinese team based in Yorkshire, for example, could boost the region's takings from overseas visitors by nearly 50% - an extra £144m.
There would be similar benefits if teams from countries such as the USA, Germany and Russia were based in Yorkshire.
The International Olympic Committee will announce the winning bid on July 6. Competing with London to host the Games are Paris, Madrid, New York and Moscow.