I’ve listened to this album so many times and cannot believe I’ve never noticed Veridis Quo is literally Very Disco.

That would be about 160 ppm off, more than I'd expect if the track was recorded digitally and set to 123.45

Did you mark or like did a FFT of some sort?

I imported the .wav track from the CD, manually put the BPM on 123.45, cut the first 21 seconds intro out (easier to sync on the main beat), and from there started dragging the track and adjusting the BPM, so that the first bar of the song and the last bar of the song were still on beat. My findings is that it's somewhere between .47 and .48

that part you bit off could account for the difference?

in verlan, Discovery is pronounced “verydisco”