Battle, WR didn't have 'models' as such, it was a gradual evolution of design and style based on WR patents for action, bolting, ejection, forend catch. You will also find the 'dicky bird' safety and classic boxlock interceptor sear which are also WR originating patents. Digs describes the evolution very nicely in the Vintage Guns article link from ksauers1 above. It should be remembered that most of the UK gunmakers didn't do 'models' as we would know them today although there are notable exceptions such as the MacNaughton' Edinburgh', H&H 'Royal' and Churchill whole range. However even these evolved through several very different versions.