Correspondents include: Herbert Williams on Allen Clark, [Joint Managing Director] of Plessey Company Limited (2); Allen Clark on his report of a visit to munitions works abroad, and Plessey's plans for a similar mortar- shell plant (7); Lieutenant-Colonel Sir Hugh Elles [Master General of Ordnance] on Clark's report and armour-piercing bullet tests (2).Also includes: copy of Clark's report on his visit to munitions works in Germany, Switzerland and France; copies of correspondence by WSC and Violet Pearman [Secretary to WSC].