It appears to work here:
So the site is deciding to redirect to another page if the IP requesting the page is in a list.
Possible workarounds:
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Move the server out of the IP range that has this problem.
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Use a proxy for onebox, like “Onebox Assistant”, crawl for those previews reliably!
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Contact the websites to see if there is a special header you can send
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Wait for the Brexit to take effect ?