No. Although I did see them together at the Roundhouse when they last toured a few years ago (2015/16?).
You've nudged me into looking it up, it was Mark Eitzel. Butler had produced his album Hey Mr Ferryman, and played at the Leeds and Nottingham gigs on the tour.
Edit: for what it's worth...
Flew to Stuttgart to see Ritche Blackmore a few years ago (sounded dramatically better in person than in any of the clips I've heard from the DVD. Made a long weekend of it.
Drove from King's Lynn to Leeds and back on the same night once to see somebody who I knew had Bernard Butler playing with...