This is part of a series of Sinfonia of London/John Wilson SACDs on Chandos that has received many raves. I found the following (hilarious) review on Amazon. I had to go back and listen to the Bolero track to see if I could hear the "fleet footed snare drummer" wandering all over the soundstage:
[T]he snare drum(s) that is so prominent in any performance of the Boléro, is inaudible until 3:22 on the SACD. [Huh??] . . . . Having listened to the multichannel DSD layer of the Boléro several times in anticipation of the revelation of what the ‘Premier Recordings’ entailed, I was struck by the shifting location of the snare drum(s) which abruptly changed channels in much the same way as early recordings of steam locomotives on Decca Phase 4. The snare drum, as noted, appears at 3:44 in the left channel and abruptly moves to the right channel at 5:44. At 6:24 it moves back to the left channel and at 7:11 remerges in the right channel with no image or echo in the left channel. At 7:56 it then moves to the left with no image on the right. moving back to the right at 8:44 and to the left at 9:31. At 10:14 it again moves to the right moving back to the left at 11:00. At 11:46 it moves back to the right with greater emphasis (the possible addition of the second snare drum at Figure 16 that was noted by another Amazon reviewer as “hardly noticeable unless specifically listening for it”?). At 12:39, the snare drum is present in both the left and right channels. This wandering snare drum effect, is no doubt the result of the mixing and mastering of the DSD files rather than a exceptionally fleet footed snare drummer. While less pronounced, the wandering snare drum is also audible on the CD layer and contrasts with any and all performances of the Bolero that I’ve heard over the past 60 years where the location of the snare drums(s) is fixed.
https://www.amazon.com/gp/customer-reviews/R2VVN1MHJS50K0?ref=pf_vv_at_pdctrvw_srp
It's hard to imagine Chandos would intentionally or unintentionally pan the critical snare drum all over the place. Maybe, instead of having the second snare drum player sit idle until Figure 16 in the score (where he/she joins in), Wilson split the snare duties between the two players? Anyway, perhaps this falls into the category "of interest to no one" except cranks.