After I first read about it I did some light cursory Googling around, and the press coverage that was the most detailed at the time was @ The Register [1]. Although they report the number to be ~317k, they do not disclose a source -- but I chose to go with it anyway.

To be honest I forgot that folks around here can get their panties in a real bunch over the titles of submissions -- and I'm not saying they're wrong, but in my mind the title is far less important than the actual meat of the issue and the discussion/debate that it (hopefully) generates here on HN. However, there are rules for the titles, and it wasn't my intention to break them. It was my mistake.

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1: https://www.theregister.co.uk/2018/03/29/eu_dumps_300000_uko...