What is it for?

[Cartus]

....hook in the middle underside of my VW Scirocco's parcel shelf? I’ve only had the car nine years and still no idea

 

[cambsno]

Hanging something, so if you had a bag for example rather than roll around the boot...

 

[AndrewFlannigan]

Hanging something, so if you had a bag for example rather than roll around the boot...

I think you're right. VW seem to refer to it as "the bag hook".

 

[GeordieStew]

Securing your captive boot passenger so that they can't escape are safe.

Or maybe a hook to stop your bags rolling around.

 

[Box Brownie]

A curry hook (as in take away curry)

 

[AJQS]

What a useful idea...I'm off to make one for the Volvo!

 

[Cartus]

Thanks everyone, I learn something every day

 

[mj4456]

I have seen these on various cars, when the tailgate is up and parcel shelf raised this is to attach the the boot floor covering to allowing easy access to spare wheel etc, there should be a small toggle on the mat for this purpose.