A few weeks ago I rung up Tom Copas to see if I could come to do an interview at his turkey farm. He casually mentioned he was using alpacas to guard the flocks. It was an opportunity too good to miss and I got on a train with just an iphone and a mic. The light was great, Tom was patient and the alpacas behaved themselves. The result is an epic tale of turkeys, alpacas and a battle for farm yard supremacy for BBC online