Posted by Mike on August 08, 2002 at 18:29:44:

In Reply to: Copyright questions posted by Panu Höglund on August 08, 2002 at 05:35:11:

I'm not exactly sure but best to contact Orwell's literary estate.

The is also the massive George Orwell collection held at University College London:
http://www.ucl.ac.uk/Library/special-coll/orwell.htm

General rule for most publications is that copyright expries after 50 years, then works belong to the public domain.