He mentions a site near Slough, west of London but doesn't give an exact location. The photo looks like magnetic loop antennas.

Slough has a large number of data centres, would that be the location of the servers for London Stock Exchange?

Also, don't forget the recent post about a HFT intrusion into the 20m amateur band.

https://news.ycombinator.com/item?id=25733406

Articles from a prior year, in this case 2018, are supposed to have the year in the title.

Noted, thanks.