Last surviving British Dambuster - George 'Johnny' Johnson

We are slowly and inevitably losing the generation of men who fought in and survived the last world war. HARDtalk’s Stephen Sackur speaks to 96 year old George ‘Johnny’ Johnson – the last remaining British survivor of one of the most extraordinary and most famous aerial missions of World War 2 - the Dambusters raid. It was costly and not entirely successful. So why has it become such a part of Britain’s national folklore?