also whilst on subject, ive decided what headunit to get, only things im not 100% on are which ISO leads, i need, think these are the correct ones, the cr doesnt have bose, but has the little sub and amp in the rear corner of the boot
http://www.caraudiodirect.co.uk/audi-wiring-adaptor-speaker-input.html
info:
This adaptor will enable you to replace your factory fitted stereo with an aftermarket unit, and connect it to your factory fitted 'Active Speaker System'. Fits the following models:
Audi A3 without BOSE system (Oct 1996 on)
Audi A4 without BOSE system (Feb 1995 on)
Audi A6 without BOSE system (Jun 1994 on)
Audi A8 without BOSE system (Sep 1994 on)
Audi TT without BOSE system (Mar 2000-Feb 2007)
and radio surround:
http://www.caraudiodirect.co.uk/audi-facia-adaptor-5.html
This adaptor will enable you to replace your factory fitted stereo with an aftermarket unit, and retain the original appearance of your dashboard. Fits the following models:
Audi A4 (2001 X - 2007)
and finaly do i need any fancy radio aerial adaptors, there isnt a roof mount one, only the ones on the rear side windows
cheers