The iPlayer currently has all episodes of the excellent BBC Radio adaptations of John le Carré's books featuring George Smiley - Simon Russell Beale is very, very good as Smiley and the rest of the various casts feature some of the best radio actors of our generation.
I'm working my way through in chronological order (start at the bottom of the linked page). I've just finished Looking Glass War and about to start TTSS - it's a joy to listen to such wonderful work.
You can download the mp3 files, mikey - I have done that before for 'A History of the World in 100 Objects' - now have it all on the hard-drive in my car radio thingy.
How you get them onto your player depends on which laptop/player you use.
TTSS is just wonderful - I'm two thirds of the way through & just don't want it to end.