Whilst I'm still waiting for an reply from the retailer I bought the dodgy disc from (shame on you PLAY.COM - is this good customer service?) I've managed to resolve the issue of the unplayable disc myself.
There's a superb tool called Exact Audio Copy which enabled me to rip the CD to .wav files and clean them up so that I could burn a new and unencumbered disc which plays in any of our kit, just as it should.
Up yours BMG !!