Yes, mine was built on 14th May 2003, with the last Omega built on 25th June 2003, But mine was not registered until 1st September 2003. 
Mine was registered 29th September 2003 (53 plate) but i don't know when it was built
is that part of the VIN too ?
mine will be hitting 77,777 in a couple of hundred miles 
My information was as a result of my friends at my local Vx dealer doing a search on the GM/Vauxhall records. 
Thanks for the info Lizzie

I don't have any friends at the main stealers
hopefully, it was built about the same time as yours, not that it matters too much
I'm gradually rust proofing it all, as I did my Carlton
is that part of the VIN too ?
No, but anyone with EPC can look up the date it was handed to sales.
thanks for the info TB
I'll purchase a copy from your fave internet auction site

be useful to have i guess ,