The three Cadzow brothers had an idea of producing large and tender fillet steaks from animals tough enough to survive wintering on the hills of the Scottish Highlands. It has taken them 25 years and to do it they had to create the first new beef cattle breed for nearly two centuries - Luing cattle. To accomplish their task they turned the Hebridean island of Luing into a huge experimental ranch - and changed its people's way of life. Written by Clifford Hanley From BBC Scotland