Countryfile - 28/06/2009

Matt Baker and Jules Hudson head to the Peak District to try to unravel a mystery that's perplexed aviation experts for decades. Just what caused more than 50 wartime planes to crash into the hills around Glossop? John Craven investigates whether it's a good idea to re-introduce wild animals from Britain's past back into the countryside. And down on the farm, Adam Henson reflects on the epic journey his father made to save the rare North Ronaldsay sheep.