hi guys, got a bit of a problem with the larger half of the rear seat in my avant not locking into place... i've tried slamming it into place and even pulling hard against it from the boot and it just wont lock. it just bounces back. i've poked a screw driver in the lock and it locks fine, not sticking or anything. and the locking pin is in line with the catch, but it's got me baffled... anyone had any similar problems? stu.