Thousands of pig farmers are due to march in London today, Tuesday, to campaign for fair prices from supermarkets.

They will be joined by the Compassion in World Farming. The charity is also urging pig farmers to see free-range and higher welfare as the way to save their British bacon.

"Lets pay a fair price for a fair product and make sure that our pig industry is one we can be proud of with better welfare systems and a fair deal for farmers," says Phil Brooke, Welfare Development Manager for Compassion In World Farming.

British pigs are already experiencing better welfare than much of imported products, thanks to the UK ban on sow stalls, but there is still room for improvement, particularly the provision of straw, a reduction in tail-docking and stopping the use of farrowing crate.