Mardrus got translated into English by Mathers. It's the edition I've read (partially—my copy is in four very fat volumes, so it's a lot of reading). Can confirm that it includes tons of stuff I'd expect to be missing from any kind of Bowdlerized or censored version. Not sure I'd recommend it for a modern reader in English given the other options available, these days.

https://en.wikipedia.org/wiki/Edward_Powys_Mathers