I will make the following observation, on holidays in france we would buy a cheap roof rack leading to many rooftastrifies on country roads. It is worth going to halfords and getting them to fit one for you. You can get thule roof bars and fitting kit for your car for under 100 quid. While for the most part Aldi kit is as good as the brand I've no idea how good these racks are but my experience with cheaper racks as taught me to be cautious.