I phoned up a thule recommended dealerin Crawley that sells roofboxes. Strangely enough, he happened to have owned one of these boxes and also used to own an A4 saloon and A4 avant/estate. His reconning was "The estate swallows up the roof box, the saloon has a bit of overhang, but it doesn't look riiculous. Both drove without a problem, although it feels like there is another car on top of you!" They have one that they rent out so I'm going down there, mount it, test it out and if it works out, I'll throw my cash down! If anyone has had experiences with saloons and big roof boxes, please shout, I'd be most appreciative.

Or if the boot of the car is so heavily laden that the front of the car is significantly higher than the rear, thus disrupting the downforce that the roofbox is creating.

Roof boxes are great if you need to carry more stuff than you can fit in your car. Read our guide for the lowdown on what you should consider before buying one! For more information about how to find the right roof bars for you, visit our buyer’s guide.