Who cares about Dijon? It's about the mustard. In the supermarkets around here (Germany) it's hard to get Dijon mustard. In 100% of the time it's the Maille brand that can be seen in the header image of the BBC article. However it contains preservatives and I don't see why mustard needs to contain preservatives. By chance I discovered that Löwensenf is the same as Dijon mustard without preservatives, available everywhere and cheap.