Many thanks, Mike and Kimberley. I've bought and downloaded the appropriate software. Annoying that I hadn't managed to find it on the Office site before.

Microsoft site design leaves a lot to be desired, it shouldn't be so difficult to buy something from them. Also noticed that it didn't give me a chance of languages in the installation package. It was Svenska (Swedish) or nothing. This wasn't a problem for me, but could have been a problem if I had asked a non Swedish speaker to install it for me!