Raymond "Jerry" Roberts on cracking the Tunny code

Raymond "Jerry" Roberts - the last of a top World War Two codebreaking team at Bletchley Park - has died, aged 93, following a short illness.

Captain Roberts, from Liphook in Hampshire, was part of a group that cracked the German High Command's Tunny code at the British listening post.

In this interview first broadcast in February 2010, he spoke to the BBC's Technology Reporter Andrew Webb about his work.