Inside the trunk at the top LHS of the spare wheel well is an identical option code sticker to the one that was stuck in the manual for that vehicle.

 

Thank You!

The last for order to upgrade is head unit now)

 

I recently bought a 2010 GT Speed and was unsure of the options on my cat too

I called Bentley USA and spoke to a guy called Dwight (Tel 800 777 6923)
He asked for my VIN No and sent me an email showing all the options that the car had - "as standard" options were listed as well as well as "Cost Option" features

I was very impressed by this service

I am sure that this info would be available in other countries also

Best of Luck
Camaz