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Thanks for your responses. That news posting seems to explain what's been occuring on my machine then, although it's been happening for a couple of days, so I wouldn't call the broken certificate problem 'brief'! Yesterday, I managed to locate a contact email address on the French National Gendarmerie website about this, so I'll see if they get back to me as well. Anyway, thanks again.
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Presumably they're both hosted in the same datacentre, and the provider is using the same SSL accelerator / NAT / gateway front-end system for both sites.
Some admin problem caused it to briefly present this other certificate, even though the site had not been compromised
Mark