Fatal error

Trying to uninstall MJ I get:

Fatal error: Class 'ScientiaHelper' not found in /home/birmingh/public_html/administrator/components/com_mobilejoomla/classes/mjinstaller.php on line 992

Help appreciated - or can I uninstall by just deleting the relevant tables in the DB?

I'll reply myself - there is a bug in the Mobile Joomla uninstall file. Line 991 has:

include_once( JPATH_ROOT .'/plugins/mobile/scientia/scientia/scientia_helper.php' );

It should read:

include_once( JPATH_ROOT .'/plugins/mobile/scientia/scientia_helper.php' );

The uninstall procedure also requires quite a bit of manual uninstallation.

What MJ version do you have?
Latest version has (line 1002, github.com/mobilejoomla/mobilejoomla/blob/master/classes/mjinstaller.php#L1002):



So, in your case, update to the latest version and uninstall then would work correctly.