There's a rolled lip at the bottom edge of your dash, take a glass bottle of your favorite beverage(it helps if it is British Beer) and stick the cap inside this edge so the lip catches on the underside of the cap, tilt up until the other side of the cap touches the bottom of the parcel shelf, the bottom of the bottle should be facing forward. Give a quick flip upwards and then quickly down so as not to spill said beverage and enjoy.
Cheers!
Edit: This needs to be in the Tech & DIY section as all Series II & IIA owners need to learn this valuable skill.
