Cameron parking his tanks in the Lib Dems’ backyard

David Cameron visits an Age UK centre in Plymouth

Tim Bouverie, our political producer, is in Devon with David Cameron. He reports:

David Cameron is once again touring a series of Lib Dem seats in Devon. This is becoming a major theme of the Conservative campaign – they have clearly calculated that they are unlikely to take sears of Labour but rural Lib Dem seats are ripe for the picking.

The Conservative campaign has hit some bumps – today they are coming under fire over appears to be two not entirely costed policy announcements.

Meanwhile at the Pennywell Farm in Devon the people we spoke to, even some Conservative voters, felt that the mudslinging should stay in the pig pens and out of the election campaign.