"Copyright in a literary, dramatic, musical or artistic work (including a photograph) lasts until 70 years after the death of the author. For films, copyright lasts for 70 years after the death of the last to survive of:
• the principal director;
• the authors of the screenplay and
dialogue; and
• the composer of any music
specially created for the film.
Sound recordings are generally protected for 50 years from the year of publication. Broadcasts are protected for 50 years and published editions are protected for 25 years.
For copyright works created outside the UK or another country of the European Economic Area, the term of protection may be shorter. There may also be differences for works created before 1 January 1996."
Source:
http://www.ipo.gov.uk/c-basicfacts.pdf
Chris