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In page The Army Game:

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Geoffrey Sumner played Major 'Piggy' Upshot-Bagley, the commanding officer, with William Hartnell as Company Sgt Major (CSM) Percy Bullimore, the bane of Hut 29's army life. Michael Medwin was the spiv-like Cpl Springer in charge of Hut 29, with the original conscripts consisting of Bernard Bresslaw's IQ deficient Pvt Popplewell, Alfie Bass's Pvt 'Excused Boots' Bisley, Charles Hawtrey's Pvt 'Professor' Hatchett and Norman Rossington's Pvt 'Cupcake' Cook.