I seem to remember a couple of recent posts about how difficult it is to find the new Caran d'Ache 'Colours of the Earth' inks in the UK. I was in Oxford today, and I can report that Pens Plus has the range. Infuriatingly, the shop is closed for the week , but I could see the bottles in a special display on the counter when I pressed my desperate, tear-stained face to the window. Here's the shop's website (don't be put off by how poor the site is; the shop itself is very good):

http://www.pensplus.co.uk/

Neil