What am i missing, apart from my marbles.

Ok so the arm rest is tilted back unless im on the motorway. But the top bit falls down, im assuming im missing a clip or catch of some sort, heres the pictures.

 

someone has got to know?

 

Yup, you're missing a small catch which is meant to hold the lid in place.

It attaches directly to the lid, where those holes are in your second photo.

 

Thanks redline. ill have a scan on ebay.