Stan:
I have a Hollis, and what is left of the colours are as you presume English colours to be. However... I would caution against re-casing the gun simply for cosmetic reasons. It will be more valuable and less garish if you don't. The colours were originally there for sales appeal anyway.
But if you insist on re-casing, please consider Classic Guns of Crete, IL. They do the best job of recreating the UK style:
http://www.classicgunsinc.com/The more "notable" re-case shops of the US are notable only for something less than you'd want.
Best, Kensal
