Moved site to UAT - image src code not rendering

Have a site ready for launch- moved it from my local dev to a uat subdomain of the final domain. Uploaded all files and database. Everything looked fine - able to log in no problem. Decided to change an image but the image did not appear in the template. Tried uploading brand new (never been in on the site before) image and that loads into assets ok. However when i try and add that or any image already in place to the template it is blank. I can see the image src isn't being written.

<p><img src="" alt="Limpsfield High Street"  class="image-round" /></p>

Template

<p><img src="<perch:content id="image" type="image" label="Image" width="307" height="307" crop="true" />" alt="<perch:content id="alttext" type="text" label="Image alternative text" title="true" />"  class="image-round" /></p>