Ian, get yourself some nylon washers of the right diameter to pack under the hinge, thereby raising the door height to line up with the catch. The originals wear away over time.
God luck.
Jock.
Jock,, I just saw your post as I’ve just done a quick fix,, I’ve put two washers under the top part of the hinge and it now closes perfectly,, I can now go and get four nylon washers, same size and swap! I’m well pleased,, the door is closing better than it ever did! Xxx