I agree almost totally with Fiona's comments on the radio shows, however, being badly written and acted does not influence whether they are canon or not, otherwise you could select which of the TV episodes you didn't want in canon.
The discussion at Redemption asked the question if the radio plays were canon or bull. A clear majority regarded them as both, in other words they were canon despite not being very good and having a number of flaws and discontinuities.
-- cheers Steve Rogerson http://homepages.poptel.org.uk/steve.rogerson
Redemption 03, 21-23 February 2003, Ashford, Kent The 25th Anniversary Blake's 7 Convention The 10th Anniversary Babylon 5 Convention http://www.smof.com/redemption