Letter from John Ryle, Regius Professor of Physic, Cambridge University, to WSC on a campaign to boost national morale, output and the Home Front and also advice allegedly given to a special constable not to retaliate in case of invasion, with reply by John Peck [Assistant Private Secretary to WSC]; letter forwarded by Peck to Arthur Poynton [Private Secretary to Minister of Supply and Minister of Production] and Henry Strutt [Principal Private Secretary to Home Secretary], with replies by Peter Hayman [Assistant Private Secretary to Home Secretary] and Poynton; with poster for measuring ammunition production.