Drivers door latch

[BlueWedgy]

Hi I seem to have developed a drivers door latching problem.
The door has to be shut really gently for the 2 stage latch system to work. Slam the door hard and it bounces back open. I also notice that even with the second latch fully engaged (door fully closed) the door can be pulled open (flicking the latch to the open position), this is a little disconcerting should I lean on the door whilst driving as it could well fiy open. The MOT is also due in couple of months.

Has anyone come across this?
I haven't taken the door card off yet to investigate, just hoping of some words of wisdom before I dive in.
Are these Cortina or Granada latches? As always finding the correct parts are getting harder and harder to find.

Cheers

Edited by BlueWedgy on Monday 25th March 19:26

[BlueWedgy]

Thanks guys. I am unable to get to it at the mo having dropped a trolley jack on my toe.
I will take it apart once I am able to kneel down again.

The door does not have free play nor looking like it has dropped. It does however seem further forward than the passenger side.
Thinking about it, this all started when the window popped out of its runner, so there may be something getting snagged when I put it back together.
All things to look once I stop hobbling around.

Many thanks

[BlueWedgy]

This is all sorted now.
It was to do with the length of the inner door handle rod that connects to the door latch. it was just slightly too short pulling on the latch.

Many thanks for suggestions and information.

Cheers