Further to what Chris said, the liner notes for the SB "Getting To The Point" CD which has "Taste & Try Before You Buy" and "Someday people" (the SB single Bruns played on as a member of SB & on that CD reissue as bonus tracks) John Tracy of Decca says in the liner notes that though he couldn't locate the recording date(s) for the session(s) that produced these 2 tracks he said the line up with Bruns had "rehearsed and toured togeher for 3 or 4 weeks prior to the release of the single which was released on Nov 24 of '67 so even if we only go back 3 weeks that takes us to Nov 3 he was definietly in SB and I highly doubt he got the SB job on Nov 2 and they raced in to record these tracks in between the rehearsal & tour dates they had been doing. Tracy also says in the liner notes for Crusade that McVie had left Mayall around the UK release date of the Bluesbreakers "Crusade" album which was McVie's last for Mayall as a member and he says that was Sep 1st. So again, even if we say "around" means after that date (and we'll stretch it and say he left Mayll Sep 30th) it couldn't have been much longer I mean if the rest of FM were so eager to get him in there, why would they then tell him to sit around for a few months doing nothing while we do these gigs with Bruns?
Again, not trying to cause disention in the ranks juist trying to chime in some historical dates we can work with in trying to figure this thing out is all.
John