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Thanks folks, I have searched online, but these people seem to flit between PO boxes and batches. The particular jar I photographed is one of a batch which, if I could find it, I would buy the whole lot, it is utterly mind-blowing. It's not a chilli extract, it's not really a sauce, but it is a wonderful mush of scotch bonnets, no chewy bits of skin.
No phone number, no web address, so ultimately I may have to write to them. 4 jars should see me through to about November, it really is that hot, and to be treated carefully if you need to be up and about the next morning.