Here's a piccy of the correct pattern (a copy made by Pop's Leather in Incerlik, Turkey and not the genuine Aviation Leathercraft item). The link above with Rory Underwood in the picture is close
but is not the official pattern - this has only ever been available to RAF Aircrew. The Rory Underwood jacket differs in that it has knitted cuffs and not the "storm cuffs" on the official pattern.
The Union Flag is a Op Northern Watch "Blood Chit" that can be stitched in at $10 or so.
By the way, the post on the first page has a pic of the jacket without a brevet holder for those that don't want/need it.
Saw a few around MoD today on Wednesday "Uniform Day".
LJ
PS. there are some pics within AP1358 within the aircrew clothing section.