a series of model letters have been drawn up with carefully pre-crafted messages designed to woo voters with just 28 days to go before the may 7 election .
women are told they are ` vital to the success of the british economy ' while pensioners are praised for their ` wealth of experience ' .
a series of model letters have been drawn up with carefully pre-crafted messages designed to woo voters with just 28 days to go before the may 7 election .