First off, please accept my humble apologies, i drive a 2011 Meriva B... and to make things worse, it's the one with the little 1.3 diesel engine too!! (A13DTE) 

But i want to do a few upgrades on it if i can, and this forum seems to have the best people who change things about and generally make things work where others say it can't be done.

I'd really like to upgrade the CD400 radio unit i have to one of the sat nav units with bluetooth etc, the ones with the colour screen in the top of