Farmers have left their fields for the streets of London to protest changes to the inheritance tax announced in the budget.     On the Sky News Daily, Niall Paterson heads to the protest outside Downing Street to speak to the farmers who are threatening to withhold food supplies if their demands aren’t met.     He also asks new farmer Jeremy Clarkson about why he thinks farmers should have inheritance tax relief.      Plus, business correspondent Paul Kelso breaks down the figures to show exactly how many farmers could be affected.     Producer: Emma Rae Woodhouse   Editor: Philly Beaumont