Another lil update, firstly as I had no faith anybody would do anymore I took matters into my own hands, I removed the close coupling between the drop cable and power cables and since then no events on my DSL, OK it's only been just under 48 hours as I did it Monday morning.
If you removed the close coupling between the 2 cables and the interference has gone away for 48 hours, then I was on the right track way back by stating "those 2 cables will definitely need more shielding or re-routing".
And the graph that you posted at the same time was definitely mains hum according to the shape.
So it looks like REIN interference from the mains was in the mix after all.
Edited by deleted (Tue 30-Aug-16 22:21:24)