Tax bias plea.
Mr Darling was forced to offer tax cuts worth pounds 2.7 billion to stave off a backbench revolt over the 10p change earlier this year, but six million people are still worse off overall.
Former minister Frank Field and fellow-rebel Greg Pope have written to the Chancellor urging him not to forget this group in a PBR which is expected to feature tax cuts designed to inject some vigour into the ailing economy.
He said: "Labour backbenches will not abandon the poor who have still not been compensated. The Treasury can surely find pounds 1 billion to ease the resentment of our core voters."