if you go here : http://www.topgear.com/uk/nissan/350z then scroll to the bottom of the page you will see links to the official uk site and the owners site below.
Strangely enough official link goes to http://www.nissan.co.uk/
then owners goes to http://www.ntoc.co.uk/ with the heading of rice burner.
Honestly this site is too crap for words.
the contact details needed are :
Top Gear Online
General enquiries:
By email/telephone
tgweb@bbc.co.uk or call 020 8433 3598
By post
TopGear.com, Second Floor A, Energy Centre, Media Centre, 201 Wood Lane, W12 7TQ
Lets get people at least looking in the right direction