Thanks Ivan. I have already tried buying a domain, then established that Wordpress won't give their free version if you want to use your own domain.

Also, even though I can download Wordpress on the site I used when I bought the domain, I have to buy a hosting package from them before I can do that, and that would include a domain.

I'm now cancelling the domain and getting a refund, then I'm going to look into either buying a hosting package that includes one, or getting free Wordpress.