What details are available are in the Calyx chronology -
http://www.calyx-canterbury.fr/bands...o/nucleus.html
You'll see it's all quite confusing, as there are instances of Jenkins still performing with Nucleus up to early May 1972 (this is in fact documented in a YouTube video), although he doesn't appear to have still been a regular member at that point, and the first documented Karl Jenkins Group concerts were in late February (actually it was during this Ronnie Scott's residency that Babbington recorded his guest bowed bass solo on Soft Machine's "As If").
Not sure whether the KJG line-up was always the same, but for a gig in mid-April 1972 it consisted of KJ, Art Themen, Chris Spedding, Dave MacRae, Jeff Clyne, John Marshall. Interestingly, this has 4 of the founding members of Nucleus, but also, in MacRae, a then-current member.
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