Trident T4 underbed drawer - how to remove?

We have lost several items down the side of the backseat/bed that we assume must have fallen behind the drawer below - but cannot remove the drawer to access them.  Could some kind soul please explain how to get the drawer out and back in again?

Did this once -with help. If I remember rightly you need to remove a number of screws from the runners. The drawer will then come further forward so that you can get a hand in. Or one of those tools that is a flexible rod with a "grabber" fixed to it. Best of luck. As I recall it was  quite a difficult task.

Think I half pulled bed down then put my arm down the back and searched.