On 13/12/2017 18:26, Grumps wrote:
On 13/12/2017 17:13, Brian Gaff wrote:
Water in the cable damage somewhere, almost anything. I'm assuming its
jolly old copper rubbish from bt. Brian

Thanks all for your suggestions.
It's too difficult replying to all as the line is up and down like a ...

The ISP is Sky.
It's one of their fibre products, with copper to the house.
The line test says that there is a little echo but no noise.
The cables are all underground so no trees rubbing etc.
Could be water in the cable, who knows.
There are no local wacky Xmas lights.
I have a man coming round on Sunday. Likely he'll have no clue, but I'll
keep you posted.

Just if anyone is interested...
The Sky/OpenReach engineer did NOT turn up, so none the wiser about the
"non specific" fault they detected.
But the problem turned out to be a laptop with a new install of OneDrive
which was hogging the router during its initial sync.
Has been sorted by setting max upload/download limits within OneDrive
settings.