"He was involved in cracking a code which the Germans called Lorenz, Britain called it Tunny, " he said.

BBC: Suffolk

Mr Roberts, of Hampshire, was among four founder members of the Testery section tasked with breaking the German High Command's Tunny code.

BBC: Raymond 'Jerry' Roberts

He is now the last survivor of the nine cryptanalysts who worked on Tunny, and has spent the past four years campaigning for acknowledgement of his colleagues.

BBC: Raymond 'Jerry' Roberts