Maybe Labour can hold on to a fraction more of its core vote, if it plays the 'Tory Toff' card against Cameron et al.
That said, Blair and Brown have faithfully served the interests of big-business and the rich since 1997 to make Britain its most economically unequal since 1945. New Labour is as much in the pockets of big money as the Tories.
Attacking Toffs is not the key issue. Britain needs a political movement to struggle for greater social equality - and that is not on offer from either the Tories or Labour.