Margaret Thatcher and other politician signed lettersA typed letter beautifully handsigned by Margaret Thatcher praising the Royal Observer Corps. Signed letters from other prominent politicians and military figures, including prime ministers Jim Callaghan and John Major Superb provenance In June 1992, author Henry Buckton began assembling correspondence from British politicians and military personnel to illustrate his book "Forewarned is Forearmed" (The Royal Observer Corps motto). The letters include