O2 was forced to pass on the customer details of 9,124 IP addresses, which had carried out illegal downloads, to the production company after it won a court order in March.

The High Court has approved the content of the letter that will be sent out, according to the BBC.

Ben Dover has said it will target users who had uploaded films to others, but not people who had just downloaded one film.

"In our first letter we seek to find out more information regarding evidence of an infringement of our copyright," Julian Becker, Ben Dover's commercial director, told the BBC.

"Depending on the response to our letters we will then decide our next action."