So, with two of the files failing even to be included in the feed at all, and two of the files being included but faulty, I'm going to continue the tests with the faulty ones.
iTunes
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200815December
Podcast tests - second run
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200815December
Podcast tests - iTunes
Podcast test of iTunes generated mp3 file
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200815December
Podcast tests
A bunch of mind-numbing tests will now follow, as we try and work out which culprit is breaking the RSS podcast feed.