Help testing podcast, no episodes show in feed

I'm sure I'm making a really basic error but we've recorded a podcast episode and I'm trying to upload the feed to iTunes, however, when I try the 'Subscribe to podcast' option in iTunes to test the feed no episodes show.

So far, I've created the podcast and it is on our server (tell me if this is not a good idea and if I should host it somewhere else for any bandwidth issues) an created the XML file following the guide at http://www.apple.com/itunes/podcasts/specs.html

I tried initially testing the URL in iTunes pointing to the XML file on our server and that did not work, I've then tried to create the XML file as a RSS page on our website. In doing this it does seem to be recognised as a RSS feed but again, the episode does not show. The webpage for this is http://baseballsoftballuk.com/podcasts/feed

I've also included the XML file below if it helps, I'd really appreciate any advice.

<?xml version="1.0" encoding="UTF-8"?>

<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">

<channel>

<title>BSUK Podcast</title>

<link>http://baseballsoftballuk.com/podcasts/feed</link>

<language>en-gb</language>

<copyright>&#x2117; &amp; &#xA9; 2015 BaseballSoftballUK</copyright>

<itunes:subtitle>The official podcast of British baseball and softball</itunes:subtitle>

<itunes:author>BaseballSoftballUK</itunes:author>

<itunes:summary>The only podcast dedicated to British baseball and softball, we bring you news, interviews and other random ramblings from coaches, players and others involved with baseball and softball.</itunes:summary>

<description>The only podcast dedicated to British baseball and softball, we bring you news, interviews and other random ramblings from coaches, players and others involved with baseball and softball.</description>

<itunes:owner>

<itunes:name>BaseballSoftballUK</itunes:name>

<itunes:email>podcast@bsuk.com</itunes:email>

</itunes:owner>

<itunes:image href="http://baseballsoftballuk.com/assets/bsuk/podcasts/bsuk_podcast/bsuk_podcast.png" />

<itunes:category text="Sports &amp; Recreation">

<itunes:category text="Amateur"/>

</itunes:category>

<item>

<title>BSUK Podcast 1: Liam Carroll, Great Britain Baseball</title>

<itunes:author>BaseballSoftballUK</itunes:author>

<itunes:subtitle>A short primer on table spices</itunes:subtitle>

<itunes:summary><![CDATA[In the first episode of the new BSUK Podcast we speak with new Great Britain Baseball Head Coach, Liam Caroll. Liam tells us how he got to play baseball in the US with Porterville College in California before moving in to coaching with the NCAA D1 University of Nevada Las Vegas. Liam also talks about his career with GB Baseball, his preparations for the 2016 European Baseball Championships and his aspirations for the future of British Baseball</p><p>Follow BaseballSoftball<em>UK</em> on Twitter <a href= "https://twitter.com/bsuk" title="@bsuk">@bsuk</a></p><p>Check out Liam Carroll on Twitter <a href= "https://twitter.com/liamcarrollGB" title="@liamcarrollGB">@liamcarrollGB</a></p><p>You can also follow Great Britain Baseball on Twitter at <a href= "https://twitter.com/GB_Baseball" title="@GB_Baseball">@GB_Baseball</a></p>To find out more about BaseballSoftball<em>UK</em> and for details of how you can get in to the sport as a player or coach visit <a href= "http://baseballsoftballuk.com" title="baseballsoftballuk.com">BaseballSoftball<em>UK</em>.com</a></p> ]]</itunes:summary>

<itunes:image href="http://baseballsoftballuk.com/assets/bsuk/podcasts/bsuk podcast/bsuk_podcast.png" />

<enclosure url="http://basebalsoftballuk.com/assets/bsuk/podcasts/bsuk_podcast/BSUKPodcast#1Liam Carroll11May2015.mp3" length="35154128" type="audio/mpeg" />

<guid>http://basebalsoftballuk.com/assets/bsuk/podcasts/bsuk_podcast/BSUKPodcast#1Liam Carroll11May2015.mp3</guid>

<pubDate>Wed, 13 May 2015 17:00:00 BST</pubDate>

<itunes:duration>36:37</itunes:duration>

</item>

</channel>

</rss>