I finally found time to sort this out on our car.
Cant believe I left it for over a year before tackling it.
To fix this the whole centre console has to come out. It is quite easy to do but just time consuming. There is only 2 nuts, 2 torx screws and an allen bolt holding the centre console in place after the trim at the rear and centre console trim is removed. There is however quite a lot of wiring that needs disconnecting and clips removed from the console before removing.
The only reason the whole console needs to come out is because the trim that covers where the pins are is screwed on from underneath.
Once its out and the plastic housing is undone that covers the pins I found this

One pin was out completely and the other was making its way out.
I searched the whole of the car and although there seems to be a space on the right side of the hinge for a small gear there was none to be found so I can only imagine that it only needs one on one side to operate.
I pushed the pins back into place and job done. Pic of how it should look.

The pics are a bit blurry but there is a knurled part on the pin which should be pressed into the plastic to secure it. Maybe this wasnt right from the factory or just isnt a tight fit and worked its way out.