Professor David Blanchflower, a former member of the Bank of England's monetary policy committee and a critic of the Government's austerity policy, has described today's GDP figures as "disastrous".
He told the BBC News Channel that the Government's austerity programme is "nonsense" and that its recent initiatives to stimulate growth will take three years to kick in.
He called on the Government to "give firms incentives to hire and invest today...because otherwise the economy will carry on downwards".
Will the public accept Chancellor George Osborne's explanation on why the British economy is stalling?
The economy shrank by 0.7% between April and June, leaving Britain in the longest double-dip recession in more than 50 years.
New GDP figures out tomorrow will reveal whether the British economy has sustained its downward slide by shrinking between April and June