Interesting side effect is the determination of current TML in the Regulus environment with the faint double BRT1267 as part of the close environment of Regulus (see attached map).
WDS lists BRT1267 with 4" +10,3/11,6mag - this parameters suggest 120mm for resolution under reasonable good conditions. With the 140mm refractor I had +11.9mag and with the 120mm refractor in another location with somewhat less light pollution I had +12.3mag as current TML - in both cases basically enough to resolve a +11.6mag secondary.
But both times I could easily resolve the primary but failed to resolve the secondary - given the not this good conditions this seems inconclusive but I tend to assume that the WDS magnitudes are a tad too optimistic. UCAC4 suggests +10.63/12.39mag and this values seem valid for me and suggest at least a 6" aperture for resolution.
Will try to resolve BRT1267 next time with a larger aperture means 235mm and try to estimate the magnitudes with the help of the faint stars nearby.