George Osborne will be grilled today on the fine print of his Autumn Statement as members of the powerful Treasury Committee pick over his claims that the Government's economic plan is working.
The Chancellor said critics of his austerity programme had been ''proved comprehensively wrong'' when he delivered his assessment of the economy last week.
Experts have warned that growth is being fuelled by consumer spending rather than a business boom and have also warned that Mr Osborne could have difficulty making his sums add up following close scrutiny of the measures that were set out.
Labour insists that the economic revival is not being felt in people's pockets.
T he UK's official fiscal watchdog, the Office for Budget Responsibility (OBR), upgraded its forecast of GDP growth for this year from 0.6% to 1.4% and for next year from 1.8% to 2.4%, but downgraded predictions for the following three years.
It has warned that improved growth appeared to be driven by consumption and housing factors, rather than business investment, and a nnual wage rises are not expected to return to their historic norm of around 2% for a couple of years.
Respected economics think-tank the Institute for Fiscal Studies said Mr Osborne was relying on ''uncertain'' revenues from a crackdown on tax avoidance and an increase in the bank levy to fund giveaways in the statement.
Fuel duty will be frozen again next year, rail fares will rise in line with inflation in January rather than the planned inflation plus 1%, and married couples will be given a £1,000 tax allowance transfer.
Employers' national insurance contributions for under-21s will be scrapped to help young people into work and b usiness rates will be capped at 2% from April while £1,000 will be knocked off rates for small shops, pubs and cafes in the UK's high streets.