'Simply Delicious' do an organic mustard. They've recently changed it.
Before: label says "Made without compromise" and the mustard has cider vinegar in. It's fabulous.
Now: label no longer says that and… they've replaced some of the cider vinegar with spirit vinegar. A compromise, in short, 'cos the result isn't nearly as good.
If you see any of the old stuff around, grab it.