Adjusting the rear door

[Wander]

My rear door does not shut all the way and I am trying to adjust it so that it will. I have moved the post as far forward as I can but it hardly made any difference. The catch block is not hanging up in it's receiver and I can't see anything blocking-so what's next?

The gap is worse on the post side, it looks pretty good on the hinge side.

 

[Quentin]

Have you checed your door seals on the hinge side, ensuring that they are not interfering?
Check the slide under the door and your hinges too.
There is a bit of adjustment in the lock itself. Have a look