They've eased off on it in recent years, largely because people use it when M&S screw up. "This isn't just an Internet security issue: it's an M&S Internet security issue".
That hasn't stopped them from putting up signs like this in their stores:
The white lettering on the black background makes it look like a protest message, telling us the food isn't just.
No Fairtrade designation for your food, then, M&S!