But the responses, although pertinent have never answered any of those questions. On a whim I decided to post again on the Warhammer 40,000 Facebook Group and while I was at it showcase where it's snuck into the background of normal army shots.
As I kept on posting I got a little giddy with the hope of finding what its name was and instead decided to seize the initiative, rolled a '6' and called it 'Brian the Sewer Vent'.
Which then prompted me to set up a Brian the Sewer Vent Facebook page, as you do!
But then the GW Community Team responded with the absolute best answer EVER!
There's much more in the comments worth reading.
And I then shared it among some of the other 40k and terrain groups which means the Brian the Sewer Vent Facebook Page has over 170 followers!
This is a prime example of the new GW Community engagement and I absolutely love it. I'm also going to enjoy playign around with Facebook to collate more sightings of Brian over the years. It appears in the grimdark 41st millennium there's not only WAR, but a few laughs too ;)