Yes on Windows 10. I'm currently clothes shopping with the wife but will try that next when I get in. Thanks
So, i ran the DX setup, but it just sasy a newer version of DX is already installed, no installation necessary and then quits.
Out of impatience to resolve this I wiped my PC and reinstalled windows 10 from scratch. It has just steam and the Oculus software installed, with AC and RF2. Situation exactly the same, with no -vr launch parameters it works fine. With -vr parameters, bsod and reboot. Wasted enough time on this, and slightly exasperated! Given the somewhat glacial support form the developer / programmer I will call it a day. I receive email notifications, so if anyone ever resolves this, post away. Thanks for the efforts thus far.
Updating the thread. I completely wiped and reinstalled Windows 10. After this, neither Raceroom Racing would run in VR or Rfactor 2 which had previously been using Steam VR without issue. Out of desperation, I spent another evening wiping and reinstalling my PC for a second time. This has now resolved the problem and Raceroom is loading and running in VR. I have no idea what was causing it or why the first reinstall didn't work. I suspect it's a driver problem somewhere, but I'm happy to report this is resolved. Thanks for the help in regard to the above.