Matrix entries field prevents following Matrix field to display
My suspicion is that the entry you are defining is confilicting with the entry that Craft gives you as the entry that this template is displaying. Try this, and see if it helps:

{% set blockLinkEntry = block.blockLink.first() %}
{% if blockLinkEntry %}
  &lt;p class="ctaLink"&gt;&lt;a href="{{ blockLinkEntry.url }}"&gt;Find out more&lt;/a&gt;&lt;/p&gt;
{% endif %}