Answer: not all that hard - mostly!
The feed is working quite nicely, opening up an xml file saved from the feed, reading out what I want it to read out, and outputting it as pleasantly formatted HTML. Fantastic.
Now all I need to do is to figure out how to get it to read the XML file on the server itself. That's proving tricky, and I'm not sure why: the links I'm creating to the file just don't seem to work.
(Edit: as I suspected - it's because the script to get the XML file is hosted on a different server to the one that I'm trying to pull the RSS feed from, so it's a security issue. Hmm.)
(Further edit: and the webserver that I'm using doesn't like using PHP to access files not stored on that server. Trickier & tricker. One solution would be to figure out a way of caching the feed file each evening, so that I could just read from that file instead; but I'm not quite sure how to approach that. Will require further thought, apparently.)
More news later.
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