Spoof documentary This Is Spinal Tap has been ranked the greatest comedy film ever by experts.

The 1984 film, featuring a cast of unknowns who made much of it up on the spot, triumphed in a poll for Time Out magazine ahead of Airplane! and Life Of Brian.

A panel of comedy stars including Dan Aykroyd, Jackie Mason, Stephen Merchant and Jack Whitehall compiled the top 100.

Music mockumentary Spinal Tap was released to little fanfare but word of mouth about the film helped it to become a sleeper hit.

The rest of the top 10 was made up of Annie Hall (1977); Monty Python And The Holy Grail (1975); Anchorman: The Legend Of Ron Burgundy (2004); Withnail And I (1987); Groundhog Day (1993); Some Like It Hot (1959) and The Jerk (1979).

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