A glimpse into an abyss:

Tony Blair's appearance in Harrow West may indicate how worried Labour has become as a batch of polls show that Brown is in third place and heading for a worse result than the "longest suicide note" election of 1983, under Michael Foot. Harrow West, being contested for Labour by the international development minister Gareth Thomas, is 179th on the Tory target list.

A Tory victory in this seat would hand Cameron a majority of 84 – almost double Margaret Thatcher's majority in 1979. Labour would have 205 seats – four fewer than the number Labour won in 1983, the year when Brown and Blair were elected to parliament.

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