Three drum kits, four drummers, a sound engineer, and a whole lot of noise.
There will be some audio footage to follow, as well as some videos, hopefully, which is great because I forgot entirely to document anything that went on.
In an equipment report I can state that the favoured cymbals today are the 20" Zildjian Avedis Pang, and the 19" Zildjian A Ultra Hammered China.
Thanks to Thomas, Aoife, Tim, Tom, Richard, and Harrison for making my plan work.