A new campaign is being launched by business bosses worried that the high cost of housing in London is not only wrecking the local economy, but holding back the whole national economy.

They say that high rents and house prices in the capital are robbing the UK economy of over £1bn a year.

High housing costs are also making it difficult to recruit and retain staff, with talent increasingly being driven outside London.

The Fifty Thousand Homes campaign – whose name reflects the number of homes that backers say needs to be built each year across London – comes as new research shows just how unaffordable renting privately has become for many workers.

According to the Centre for Economics and Business Research, Londoners who work in the food and drink industries would have to spend more on rent than they earn – 112% of their pre-tax salary.

Care workers would have to spend 99% and teachers 58%.

Those working in the creative and science sectors would have to spend 57% and 48% respectively.

Even lawyers and accountants would have to spend 40% of their gross pay.

Jo Valentine, chief executive of London First, said that in a functioning housing market, the cost of renting or servicing a mortgage ought to be no more than a third of income.

She said: “This is all causing a staff retention problem for companies based in the capital, because we’re seeing employees just get fed up with the costs and the lack of pounds in their pockets, and move out of town.”

The CEBR report also says that £2.7bn could have been spent elsewhere this year had London house prices stayed in line with inflation over the past ten years.

The study said that this amount of extra consumer spending could have created 11,000 jobs and boosted the national economy by at least £1bn.

* In separate research, Countrywide says that over half of tenants who go on to buy a home can only afford to do so outside the town or city where they are renting.

In London, 36% of former tenants buy their first homes outside the M25.