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Shared credits
John Longden averages 6.35, Michael Powell averages 6.90. Apart that suggests 6.63; together they average 6.96, a lift of +0.34.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows audience votes; lines are rolling five-film averages. Films below the source vote floor are left out.
| 1929 | 6.5 | 293 | as Detective Frank Webber | Writer | |
| The Lion Has Wings | 1939 | · | 14 | as Unnamed Character | Director |
| Contraband | 1940 | · | 22 | as Passport officer | Director |
| 1942 | 6.6 | 46 | as Ground Officer (uncredited) | Producer, Director, as Despatching Officer, Writer | |
| The Silver Fleet | 1943 | · | 9 | as Jost Meertens | Producer |
| 1946 | 7.7 | 492 | as Narrator (voice) (uncredited) | Producer, Director, Writer | |
| The Elusive Pimpernel | 1950 | · | 10 | as The Abbot | Writer, Producer, Director |