Car door problem

Hi there

My car is a 55 plate turbo diesel 2.2.

I have a problem in that my passenger door will not open from the inside. I tried to remove the internal facia to see what was wrong but couldn't locate all the fixing points and screws. I think I got down to one screw or clip to undo but could not locate it. Had to abandon as I was a bit wary of applying too much force and breaking something.

Anyone know how to get into this.

Any advice would be great.

Regards

Ralph