As farmers prepare for another march at Whitehall in protest at the government's inheritance tax plans, Michael Morpurgo discusses the growing divide between city and countryside.

'The family farm, still at the heart of rural England,' writes Michael, 'is under threat, more than ever'.

Michael reflects on how, during World War Two, we needed to produce all the food we could in order to survive. He argues that, as an island nation, taking food security for granted, even today, is risky.

And he says there is a real sense these days that our pastoral roots are being 'reshaped irrevocably...by those who don't know or love the countryside.'

Producer: Adele Armstrong Sound: Peter Bosher Production coordinator: Liam Morrey Editor: Richard Fenton-Smith