Login Blocked by misconfigured LDAP connector plugin

I manage a multi-site Wordpress installation for a client.
Before Christmas, they installed an LDAP connector plugin, but never got around to configuring or testing it.
Unfortunately, the default settings prevented using the Wordpress login as a fallback.
So everyone was locked out. So I tried the usual database>wp-settings>active-plugins workaround. There was nothing there!
So I tried the old faithful "rename the plugin folder" routine. Jackpot.
I was then able to get in.

Sorted.