Only most recently has William Evans made guns. BUT, really big BUT, 'ole William was one of the best at making sure his customers got their money's worth and what they wanted/needed. His customer service was second to nobody!! Mostly, his guns came from W&S. I believe he opened (from Purdey's) about 1885 and is CIB.

On the other hand, Charles Hellis appears to have both made guns and bought in guns. Purdey's always made guns and bought in a few as an experiment in graded guns. Boss always made guns and doesn't appear to have bought in or dabbled in graded pieces. Plenty more examples in both directions and most in betwixt.