Deano:
Sorry about that rather obvious "powder, caps, projectiles" advice!
I was writing that response from my office, and didn't have access at that time to some of the images and links I needed to give a more in-depth answer regarding the accoutrements. I should have added that I intended to provide a lot more detail when I got home ... see below!
First, however, here's a "so-so" pic of my P-H repro Pattern 1853 rifle (top), with an original 3-band Snider rifle in the lower image for comparison. (Not taken together, so they are slightly different angle and scale ... but hopefully you can see just how close a copy of the original Enfield rifle - from which the Snider rifle was converted - the "early" Parker-Hale repro actually was!)
And here's one of the best groups I ever fired (100 yards, rested) with the Parker-Hale - I don't recall what caused the "flyer":
To give you some idea of the uniforming and accoutrements which went with these rifles, here is a "period" image of British Infantry, circa 1858-68. Note that the infantryman on the right has the three-band rifle, and the scabbard you can see peeking down below his haversack is for the standard triangular infantry bayonet. The Sergeant in the center has the two-band rifle, and his bayonet scabbard, which is again just visible on his left side, is for the sword bayonet:
And here is a more recent representation of a Canadian Militia infantryman from the same era. Note that, despite the differences of artistic interpretation in these illustrations, the style and cut of the uniform would have been essentially the same. Many of the accoutrements - e.g. the cap pouch, waistbelt, ball bag, bayonet frog and rifle sling - were made from "buff leather", an off-white leather which regulations called for being kept whitened with pipeclay (and later "blanco") ...
Reproductions of many of the accoutrements are available from a variety of sources - though be aware that many of the "Enfield" items offered by the US Civil War re-enactment "Sutlers" - especially bayonet frogs, slings and such - are not "correct" for British/Canadian use, since they are copies of either Union or Confederate items. (After the U.S. Springfield rifled musket, Enfield-pattern rifles imported by both sides were the next most numerous models used in that conflict.)
Excellent quality British-pattern items are available from "Mick" O'Dea, of "British Military Equipments" in Arizona:
(Mick is actually more into shooting Sniders and such, but the accoutrements he sells are patterns which mainly date from when the Enfield muzzleloaders were in use - and were just carried over and kept in use during the Snider timeframe. He also sells a correct-style buff leather sling, not illustrated in the above picture.)
Here's his website (tell him "Grant" sent you!) -
http://www.britishmilitaryequipments.com/
The bayonets and scabbards sold by the various suppliers in the U.S. are fine, however. Here is one of the repro standard triangular bayonets with scabbard:
And a repro sword bayonet for the 2-band rifle:
Here are just a few online sources of reproduction bayonets which I "Googled", at random - note that some of them also offer the significantly more expensive (e.g. US$165 before shipping) sword bayonet for the Short Rifle:
http://www.fcsutler.com/fcbayonets.asp
http://www.mercurysutler.com/bayonets.htm
http://www.blockaderunner.com/Catalog/catpg7.htm
http://www.legendaryarms.com/bayonets2.html
Hope this helps!