I'm a bit of a happy bunny today, on account of having acquired a copy of this. It's currently unavailable on Amazon (and because of Audiogo going into administration, I'm not sure when or if it's ever likely to be available, so when I saw a copy in the local W H Smith's I decided I'd pick it up. Had a slightly paranoid moment when the person at the desk trying to find it in the drawers of CDs and DVDs couldn't actually find it! But they eventually managed to find it. Haven't listened to it yet - I suspect I'll bung it on for the journey to work next week. Really looking forward to it, as I have very fond memories of the original broadcast.
Incidentally, am rather delighted that someone has uploaded some contemporary BBC continuity, included clips of the 3rd episode, to Youtube. :-)