Quick non-Drupal, but very useful, post here. There are lots of people talking about things like this on the 'net, but I've never found my specific requirements in one place. So here they are, in one place. I'm sure other UK web developers will need them!

This is about avoiding duplicate content by making sure that any requests to no sub domain (e.g. http://drupaler.co.uk) get permanently redirected to the correct sub domain (e.g. http://www.drupaler.co.uk). This way Google doesn't see duplicate content and we're like three little Fonzies, Drupal, Google and me.