Updated, I have gone back in, done the sensible thing and turned on error reporting to maximum, it turns out sigpro is erroring out with the following:
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1050 bytes) in /var/www/vhosts/bikechatter.net/httpdocs/plugins/content/jw_sigpro/includes/helper.php on line 196
I use SIGE for my gallery actually though as it allows me to add a watermark - something I requested years ago with SIG Pro but never added, this means I need to have SIGE and SIG Pro installed.
Fotis, any idea why this has happened and any chance of getting watermarking enabled in SIG Pro so I can loose SIGE?