How many movies have Lionel Jeffries and Terry-Thomas acted in together?

They have worked on 6 movies together! Their first movie together was Blue Murder at St. Trinian's (1957) and was their highest rated movie together. They have not worked together since Twelve Plus One (1969). They are most known for their comedy films together.

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Sir Charles Dillworthy
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Captain Sir Harry Washington-Smythe
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Sergeant-Major McGregor
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Major Foskett
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Det. Insp. Hook
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Capt. J. (Jeroboam) Barker-Rynde PI
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Gunner Evans
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Lt. 'Piggy' Wigg
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Joe Mangan
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Capt. Romney Carlton-Ricketts