[ALUG] Debian GB Localisation

[samwise]

Here's a new one, I haven't yet entirely figured out with Google ...

What places do I need to modify to rid myself of all the US-isms?

I've changed the Region and Keyboard layout to British in KDE, and I
also worked out that I needed to add a specific GB localisation
package for Iceweasel.

What other places exist for setting the localisation?  Are there any
other applications which require additional GB localisation packages?

I installed the localization-config tool after reading about it
online, but if I run "update-locale-config -l" there doesn't seem to
be a mention of GB English ...

Thanks for any pointers,

Peter.