Wow, that's not good. I did a search on companies house and the only listing for Staffordshire militaria was that it was dissolved via compulsory strike off in 2016 and the address listed comes up on Google maps is a building which looks like it's been empty for a very long time, I'm guessing that was it. Either they're now registered under another name or up to some dodgy stuff.
As for their prices, see my last post in Mack's