I'm wondering the same about https://www.amazon.com/dp/B01MSDDERO/ref=sr_1_1?ie=UTF8&qid=1485923255&sr=8-1&keywords=the+elder+scrolls+online+morrowind+collector%27s this one, if I ordered it would I be able to apply the DLC to my already existing game?
I would recommend getting the American CE from https://www.amazon.com/Elder-Scrolls-Online-Morrowind-PC-Collectors/dp/B01MSDDERO/
Keep in mind that the German CE has a German-language art book.
At least for me, ordering from Amazon.com instead of Amazon.de was a whopping 3€ difference. I'd expect shipping to the UK to be about the same as to Germany.
Order from Amazon.com they also deliver to germany. https://www.amazon.com/Elder-Scrolls-Online-Morrowind-PC-Collectors/dp/B01MSDDERO/ref=sr_1_1?s=software&ie=UTF8&qid=1486411693&sr=1-1&keywords=elderscrolls%2Bonline%2Bmorrowind&th=1
Pc version is now available on Amazon.ca!
https://www.amazon.ca/gp/product/B01MSDDERO/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1