Well,looks like a Webley made gun, the number 998xx is stamped on the LH side of the barrel lug, thanks JBG.
An old school chum in England has a pair of 12 bore "William Evans from Purdeys" best quality SLEs, inherited from his grandfather. Wonder who made those?. I'll look for the screw grip when I go over next time. I learned a lot today. Thank you all,
Mike