Well from the weekend everything was working reasonably with a 9 dB margin. That was until last evening when several times there were bursts of noise and margin went haywire. Router and computer were on overnight. I found that there had been trouble in the small hours, so that down speed was reduced to ~250 kbps.
Thankfully it’s more normal now speed wise, but through the day connection has been difficult, as you’ll see from the Event Log.
Strangely, having finished my breakfast watching TV, I looked out the window and saw two SSE transmission side vans by the path to the little substation, but they had departed before I could get out to nosey. This afternoon I phoned SSE, who put me on to their department that specialise in checking that equipment is working to the required standard e.g. frequencies. They agreed to test the substation and report back. It could take a couple of weeks.