Sounds fascinating.
How about weapons and armour?
It probably wont surprise you too much to learn The Order have Nikola Tesla acting as their Q - living in a basement lab making guns and gadgets
For the most part the Knights use the same weapons as the army - in this world semi auto rifles shooting black powder cartridges, MP-18 Bergman style submachine guns and Webley revolvers.
They also have their own slightly more advanced Tesla made weapons - automatic pistols and a select fire rifle that comes with an underbarrel compressed air cannon that can stun enemies


And Tesla has also set them up with arc guns and a nifty Thermite Rifle that creates clouds of thermite powder which you can ignite by shooting a flare in to the with the secondary fire.


At one point in a stealth mission Galahad uses a crossbow to silently eliminate enemies ('this takes me back' remarks the older that he looks knight)
(There are also silenced sniper rifles, a very pleasing 'triple crown' coach gun (a three barrelled off shotgun) and short play with a Shoulder Cannon - a sort of giant magazine fed bazooka)
All the Knights carry a large knife sheathed on their lower back that is presumably silver since it is what you use to dispatch werewolves.
Armour wise, their dress uniforms look to me to be Brigandine, though they also wear more subdued uniforms (probably Lined Coats) when keeping a lower profile.


(The army do have guys wearing shiny breastplates tho probably SRC Breastplates)
And all the Knights have a steampunk radio communicator on their backs they can use to talk to command and call in support from the many military airships that circle above London