I've somehow since turning on Zenpage not been able to access my site. Not even the admin. I get this error.

Parse error: syntax error, unexpected '=', expecting ')' in /home/matthewbriuk/public_html/mega/zp-core/zp-extensions/zenpage/zenpage-class-page.php on line 138

I'm hunting desperately in the MySQL to find the item to change to turn it off. So I can at least get back into the admin area.

Any help with either the original problem or what field in the database I can change to turn off that extension would be really appreciated

The info if a plugin is enabled is stored in the options table. look for an entry like plugin_zenpage. Set that to 0.

To the problem itself, please provide some info like Zenphoto version, server config etc.