Now identified thanks to UDXF as OTHR (Over The Horizon Radar) from RAF Akrotiri in Cyprus - transmitted via an antenna array known as PLUTO-II (Pluto 2)
I was sent some info from Leif via UDXF:
Some additional info related to the radar can be found
Pluto is in fact not the name of the radar, it's just
the name of the transmit antennas. Pluto-II is the new
transmit antenna array that was erected a few years back
in the salt marshes of Akrotiri (see attached image taken
from Panoramio/Google Earth). The radar's three large
receive arrays are located near Agios Nikolaos
(grid: 35°5'5.80"N 33°54'10.47"E)
Thank you Leif, I appreciate it.
Hopefully this post will help someone like me who googled for PLUTO-II (Pluto 2) and got no results.
Anyway this is what it looks like on a spectrum scope.