As the title suggest, whats the final trick to removing the headlining?

I have removed all the normal stuff but its holding at the corners, and im assuming its just a bit of glue holding it in place?

Is there any adhesive or anything towards the centre holding it in place?

Cheers for the advice

No glue anywhere, if I remember rightly.

Three "L" shaped clips across the back in a sedan (check for clips across the front too), and you need to remove the plastics on the "A", "B" and "C" columns, or at least pull them away at the top. Sun visors, lights come out. Grab handles too. And trim across top of door. If you have a TJ sedan with high mounted stop light, the rear edge rests on that, easy to get the whole stop light to accidentally fall right off.
In a sedan, the headliner goes out through the left front door, in a wagon it goes out the tailgate.

She out!, thanks for that