A brand new sing along version of Monty Python's Holy Grail movie is being shown in honour of its 40th anniversary.

The 1975 classic will be shown at 500 cinemas around the UK for one night only on October 14.

Fans will also be treated to an exclusive filmed introduction from Python stars Terry Jones, Terry Gilliam, Michael Palin, Eric Idle and John Cleese.

Dressing up as a favourite character from the movie is also being encouraged to add extra fun to the evening.