If you buy a set of Metrinch sockets (your choice as to 3/8 or 1/2 inch drive) you can deal with BSW/BSF, A/F or Metric heads. They feel a little slack at first, but will deal with greater torques because they don't drive on the corners, but on the flats. They will slacken fixings that conventional sockets will not, even after the corners have been rounded.
I have just donated my late father's thirties 7/16 hexagon drive Britool socket set to the WaterWorks Museum. I first used it in the mid fifties. Although not used for the past thirty years, only one socket needed replacement, in the late 60s. (A much used A/f socket) .
Howard