It's good to see this story being given coverage, however there are a couple of inaccuracies. It's not true that the mainstream media has ignored this story - actually the story was broken in the Scottish Daily Record and the Sunday Mail on 9th December, and then widely covered in the mainstream media.
And it was not Grayzone, but the Sunday Mail/Daily Record journalist John Ferguson who tracked the Institute for Statecraft's HQ to the derelict mill in Fife.
In the independent media the story was covered by Craig Murray and The Canary, whose report was described as "paranoia" when the issue was discussed in the British Parliament.
I'm fed up with claims of Russian propaganda everywhere too, but I can't rule out that this "Anonymous" leak might have come from a Russian source. Having said that, it's a good thing that it did leak out, and it's outrageous that taxpayers are funding secretive propaganda outfits like this.