Long Land Musket, Short Land Musket, India Pattern Musket, Pattern 1839, Pattern 1853, Pattern 1858 (both Enfields). During the Fenian Crisis, we bought small numbers of Spencers, Ballards, Peabodys, possibly some surplus Sharps'; anything from that period would not surprise me. British Army definitely had some Sharps' rifles, don't know if they ever served here, same as the Westley-Richards Monkey-tail: seem to have served mostly in India, although a VERY interesting design.
Sniders, Spencers, Martini-Henrys, Martini-Metfords, Martini-Enfields, Lee-Metfords, long Lee-Enfields, 1903 Ross, 1905 Ross, 1910 Ross, SMLE, Number 4 Rifle.
C1, C1A1, C2 etc. are Prohibbed, of course, this being a Free Country.
Boys' Rifle, McMillan or PGW if you are into the really new stuff.
If you like trainers, there is the Ross Cadet, Swift, Cooey 82, Long Branch .22, C Number 7 and there were a few C1s converted to .22RF straight-pull single-shots: likely Prohibbed by now unless scrapped.
LOTS of variety, especially if you got LOTSa bucks!