Globetrotter - 5:39 pm on Sep 27, 2011 (gmt 0)

I have a question about the canonical, hopefully i may use this thread for it.

What if you have a website www.example.com and www.example.co.uk both of the urls show the same content. Should you use one canonical for both domains and point both them to www.example.com or should each domain have it's own canonical and show the cononical www.example.com of this domain and www.example.co.uk on the other?