A Tale of Spectrum Pollution - Update 2

Typically as soon as a couple of kind amateurs from my radio club arrange to come down and to DF the source of the noise on 2m and 70cm which has been present for 9 months switching on and off at the same time it packs up, grrrrr.  

The noise has dropped from S6 between 15:00 - 08:00 to S4 between 08:00 - 22:00 by the looks of it the best we might be able to reduce the noise to is S3 but and improvement of 18dBm.

Original spectrum pollution measurement.

Latest spectrum pollution measurement.