Had a nose around, and the series doesn't seem to be commercially available (though I seem to remember the pilot being released as a movie to rent over here). It's not even listed in the voting at TV Shows on DVD! If you are a "member in good standing" at the JEH fanclub, you can order tapes
http://members.aol.com/hexnuts/video.htmlor there is a guy with very expensive tapes here:
http://members.aol.com/VictorMas/coverup.html. Might be worth an hour or so searching Google - quite often there are people selling episodes of this sort of fairly obscure show, but be warned - it's not normally cheap!