Admiror Gallery cannot create thumbnails in /var/www/southamptonmaritimefestival/plugins/content/admirorgallery/admirorgallery/thumbs/Displays-and-Stalls/
Check folder permmisions!
Admiror Gallery: 4.5.0
Server OS:Apache/2.4.7 (Ubuntu)
Client OS:Unknown
PHP:5.5.9-1ubuntu4.25