The BBC4 thing was a unique compilation of video material from the big box rather than just the Cambridge set. I lashed out on the whole thing back in November and haven't regretted it, despite its ludicrously high price, and inclusion of blu-ray discs I'll never play. But it did give me musical indigestion by the time I got half way through it: too much of a good thing, and all that. In consequence I've put it aside for a while and I'll go back to it when I'm ready.