Everyone from Cadia has a British accent, although it's not quite as ridiculous as a stereotypical British one. I'm sure you can find some fine chaps in the higher ranks of the Imperial Guard or the Inquisition. They've probably incorporated digital weapons technology (like those rings that can one-shot a Space Marine) into their monocles. He winks, and whatever he's looking at is no more.
What ho, old boy, you seem to have taken some of your assumptions as fact! Dashed thing, but there does in fact exist a Space Britain in the mythos. It's a smashing place called Praetoria, and while the unwashed masses don't like the place, any proper Praetorian gentleman should! I leave this link for your perusal, old boy. Tally ho! [link]
*grips your shoulder* Well my good sir, I find that when someone challenges another gentleman like that then he should not so easily turn his back to him. As a proud citizen of the British Empire, I can say that I shall restore my honor!
Missing? The only thing you missed was Lord Ironwolf's retelling of Captain Pondsworth. Really, do try to keep up old chap. In the finest British tradition, I welcome you to His Majesty's Ship and His Imperial Navy.
Most certainly good sir. Hello, is this the thunderhawk pilot? Oh, so glad to meet you sir, could you be so kind as to fire some orbital bombs on those pesky orks? You can? I am extremely gracious, ta ta.
Quite Classy, Battle-Brother. I do ask, where did you get that hat and scepter from? I do think that you are supposed to wield a Crozius to the noble fight? Scepters are rather valuable things from what I have heard.
Good sir, Your power armor can simply be cleaned by the servants. And also, I do declare that it feels immensely satisfying to strut up and down in front of the Guardsmen covered in Xenos, Heretic or Mutant filth.