The obstacles that London's Tech City faces

He said the Government was "sending a signal that it is not serious about enterprise" with its planning and immigration proposals.

However, the founder of PlayGen said that London still had many advantages over rivals such as Berlin.

Referring to planning minister Nick Boles's proposals to allow developers to bypass planning procedures to convert unoccupied offices into homes, Mr Star said: "This is the worst possible thing that a minister could be pushing through. It is unbelievable

"You get more rent from housing than offices so as a landlord you'd rather turn it into housing.

"We already don't have enough offices. We're already pushed to pay the maximum amount we can and it does mean that people are squeezed out. What he's proposing is terrible.

"We will lose even more of our office space, what is left will be even more expensive and it will probably kill that vibrant thing. This is not a policy that is good for enterprise.

"He's sending a signal that the Government is not serious about enterprise."

He added that expansion into Greenwich, iCity and Canary Wharf would help with space and rents as well as entrench the network of relationships that was vital to a prosperous entrepreneurial culture.

Mayor of London Boris Johnson has already said he would be looking for exemptions for the City Fringe - which includes parts of Tech City - and Enterprise Zones from the measures.

Mr Star also criticised the Government's immigration policies, talking about his own difficulty recruiting a Queen Mary masters student who "we're going to lose on a technicality, which is absolutely ridiculous".

He said: "It's very, very difficult to hire incredibly good capable and talented programmers because they're already busy, they're already working. Or they command astronomical salaries - six figures for someone relatively junior.

"Someone told me there's some 1,700 jobs that are open in Tech City and I can believe that. We've got a few open that we just can't find suitable candidates.

"It doesn't help that the Government, which is insisting it is here to help us, have made the process of recruiting rather more complicated."

But he struck a more optimistic note about the location of the Tech City concept.

He said: "What we have in London that we don't have in Berlin is a financial capital.

"While intellectual capital is key, and I would say Berlin has a few more engineers, they don't have a financial centre like London with all its wealth sitting on its doorstep.

"The real trick is how we invest the folks in the City to start investing because one thing's for sure, if you want to be big - a Google, a Facebook or a Twitter - you need an enormous amount of capital."

But he said that London was a good place to start a business. "If you want to do it, someone will help you," he said.

To see the video promoting Canary Wharf Group's Level39 tech hub, which launched this week, click here