Trouble is, John, the audio quality on the Performance Channel is so dire (128kbps intensity js, last time I checked). I have the DVDs of Gielen's Beethoven symphonies. Well worth getting, and pretty cheap too, for numbers 1 to 6 via Amazon UK. However, the DVD of 7 to 9 has shot up in price there at the moment. The DVDs offer LPCD 16/48 stereo, and 5.1 Dolby Digital and DTS.
I was interested to see the technical proof for the poor audio quality of the Performance Channel, something I had always suspected. I wonder whether Bryn (or someone else) has the figures for SkyArts. My suspicion is that the quality is much better, as the programmes are, of course! It would be interesting to see the figures.