'Lost' episode of Only Fools and Horses is discovered

A lost episode of 'Only Fools and Horses' has been found.

The 27-minute special, entitled 'Licensed to Drill', was written by the show's late creator John Sullivan and played in a few school science lessons from 1984 to educate pupils about the oil industry and encourage them to follow a career in the field, but it was never broadcast on TV.