Britain is home to some of the world's leading companies like BP, Vodafone, GSK and Tesco. The country may be laggards in areas like IT, engineering and manufacturing, but there is an opportunity over the next 10 years too for large and small businesses to become global leaders in exciting new industries like carbon capture and renewable energy.
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If you want to foster this type of growth then you need to convince people to invest. If it costs a US economist £40,000 to set up shop in the UK then do the math on what it would cost to start a high-cost research-based business aiming to compete with rivals from Asia, America and the rest of the EU. Big companies are leaving these shores at an alarming rate and many of our success stories are based on firms doing business outside the UK.
What Cameron needs to do is set out a viable plan to arrest this exodus and attract people back while at the same time as making it far easier to get on with the already difficult task of building a successful business -- whether large or small.
The majority of Britain like their public services and while Cameron says he wants to protect front-line services he needs to set out a vision of success that will ultimately be needed to fund world class services.
I sit here in an affluent part of Manchester, home of two of the richest football clubs on the planet. Just a mile or two down the road are the housing estates of Moss Side and Salford where many of the children grow up more likely to go to prison than university. There is nothing worse than wasted talent and talent is being wasted on a huge scale across the country.
Many years ago now the last great Conservative prime minister convinced much of the country to aspire. Thatcher was also one of the most divisive prime ministers of the 20th Century. Cameron, if he wants to take the good she did without further dividing the country, has to make the entire country aspire and convince everyone from banking, industry and Moss Side to believe they live in a country with a bright future.
Less hindrance for business, more help for innovative entrepreneurs, opportunity for children whatever social standing they find themselves in and a vision of hope are needed. Convincing enough people of that to get elected will be the easy part, doing it if elected will be far harder, but ultimately more rewarding than simply getting elected.
Mr. Cameron, time to convince voters, world leaders and the bond market you are that man.
So did he step up?
Well, if you are a member of the Conservative Party you will probably be upbeat after the Cameron call-to-arms for the Tory faithful. They go into the next few months believing the 13-year wait to regain power is about to end.
For the wider world, I think the jury is still out. Not much has changed for the bond market. The commitment to reduce public spending by £23 billion over 5 years is on the table but this barely makes a dent on the public finances, even on the assumption they can actually deliver it.
Commitments to raise the pension age and freeze pay for public sector workers will alienate huge swathes of the voting public. The Conservatives say they made these promises in the spirit of straight-talking to a country that has overspent and over-borrowed. But can the Conservatives convince these turkeys to vote for Christmas?
William Hague, the shadow foreign secretary, told CNBC's Geoff Cutmore that he understands the world has changed as the G2 and G20 take center stage. But in the Lisbon Treaty spat that overshadowed the first day of the conference, it was clear Cameron's team remain uneasy about where Britain fits into the EU and the wider world.