Rendlesham airbase, or what used to be it. Now just plain old Rendlesham, east of Ipswich.
It's what the location 'joke' thing is in my sidebar, the most renowned British UFO sighting happened here years ago.
What, a UFO sighting near what at the time was a fully active US airbase, I'm stunned.
As to the marks, yeah that might work, sorta what the cult troops do now.
The 'Daemon' thing is because I had a wierd feeling
40K daemons had the same advantage that musicians have in fantasy. Although it might just be my brain being scrambled with too many rulesets.
edit - oh and meant to say, have been working on a Heretics squad, once done I'll share a pic.