In answer to my own question in case anyone else Googles this and wants
to know the same you maybe could do it without the special tool but
they are 4 quid from halfords (European Radio Ramoval Keys) so why not
get some.

http://www.geocities.com/cnews05 and then follow the link to CD 6000
for some pics and words on what I found when I installed an iPod link
in the Mrs' car.

Cheers
C