1208 -29 0.1 7.040155 0 GB0SNB JO01 20
for those who don't WSPR (tch), it's a digital beacon on 7.040.155 MHz from GB0SNB. A special event station running WSPR??!
Time to google. Aha. It's a Permanent Special Event call. Not come across that before. And it's the Kelvedon Hatch Secret Nuclear Bunker in, well, Kelvedon Hatch, presumably.
And of course that led me to their website
The "20" at the end of the above is their power in dBm (Milliwatts). It translates to 100mW.
A nice catch.