Current going rates for the Webleys as follows:
Hawk Mk1 Rifle with 2 barrels - £100 - £120
Earlier Tempest pistol, worn lettering, otherwise good condition £75 - £85
Premier pistol - don't worry about the white paint infill coming out - nice condition with the 2 barrels around £145 - £165 (maybe a little more on a good day) EDIT - rethinking the Premier, maybe £165 - £180 if it is as good as the photos.
Hope this helps