Many thanks again Arthur.
While I was looking in File Explorer at the network tab I was rather disconcerted to see the following pop up.
NETWORK with KOGAN.JPG
I don't own anything 'KOGAN' so it has me baffled. It keeps popping up for a minute or so then goes away. I grabbed a Properties snip of it and googling comes up with a download for a 'tun.ko module for a KOGAN Android TV'
KOGAN DEVICE.JPG
Could I be picking up a signal of some sort from one of my neighbours.
Very Confusing.