So, looking at their readings from the data and pictures on (
https://mmaunder747.wixsite.com/swansea-ufo-network/research-information) theguys from SUFON have used a GM3120 EMF meter (
Amazon Link). Their data only shows readings in uT, so I'm assuming they have only recorded the H-Field (Magnetic) rather than the E-Field (Electric) as it would have been displayed and recorded in V/m.
I've looked at the data points that were recorded in the fields near the village. They range from from 0.42 uT to 0.77uT, and this gives
an average of 0.52uT for the Magnetic Field around Pentyrch.
After doing some background research, I thought that they may have been recording the Earth's natural magnetic field however it is nominally at level of around 50uT, but more importantly it is a static magnetic field. The GM3120 EMF meter only registers oscillating Magnetic Fields with frequencies between 5 Hz to 3500Mhz.
https://en.wikipedia.org/wiki/Earth's_magnetic_field
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@mad_hatter_87