Trying to post podcast - "Can't read your feed"

That URL isn't a feed (a text page in a specific format describing your podcast and its episodes), it's a web page containing an embedded audio player, which won't work. You must submit a properly constructed feed. May I suggest you read my 'get you started' page on podcasting which explains in detail what is involved, and then if you have further questions do please post back.

http://wilmut.uk/pc

I'd suggest you look for help on podcasting with Wordpress, there may be a module that generates feeds for you. It appears you have not enabled that or have misconfigured something. As Roger suggested - you don't have a feed setup.