According to these links:
http://www.unbeatable.co.uk/product/.../22398906.html
http://www.epinions.com/Thomson_DTH8000_DVD
The only inputs on the Thomson DTH8000 are S-Video and composite. So that means the video was converted to analog by the satellite box and then converted back to digital by the DVD recorder.
Also, note that the difference in size between the two versions is 1.75GB. PCM audio is about 10MB per minute, so even if the original version had no audio track at all, adding 96 minutes of LPCM audio wouldn't have increased the size by more than a gig.
More to the point, even if this one particular video were not, in fact, re-encoded, there are certainly others out there which are. I'm no expert, but I can't imagine that consumer-grade standalone dvd recorders are set up to make perfect digital clones of broadcast material.
It seems to me that for a site that's committed to the highest possible quality, sooner or later you're going to want to ban such recordings (for new broadcasts), the same way you've banned new minidisc recordings.
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