Sorry David to hear you have problems. You are certainly not alone with this issue it is effecting many amateurs around the country. My own solution is to move address next year to a more isolated home, so that in the future I can DX on the low HF bands should I want to.
I highlighted this problem a few months back on the reflector.The interference is different depending on your own circumstances, distance from the DLSAM VDSL cabinet, number of drop wires, etc.
It may manifest as a series of training carriers, notably on the 30m band, but I have since seen these present on 20m and now 60m as you describe.
I am located directly across the street at the edge of a village from a VDSL cabinet. The street uses overhead drop wires to feed houses their ‘fiber’ internet service.
This is a technical report submitted to the committee describing the interference at my own address. Bands effected are 40m 80m. I have used professional test and measurement equipment to quantify the noise. The report is still in a draft state, I don’t feel any more motivation to improve it, I’d rather put that effort into selling my house.
This is my report on a shared address on my google drive:
Bad news, I feel the RSGB are powerless here. OpenReach are ‘willing to help’. However the problem is they’d have to replace pretty much all of the overhead wiring as it is not suitable to carry VDSL. The old wires are untwisted, and it is absolutely hopeless to expect any balance on the lines to reach better than 20dB. Add to this problem, your counting on the guy next door to terminate and distribute their line properly.
Reporting this to John however is a must. But I wouldn’t be too hopeful of a solution. Apparently, some amateurs have had success. I cannot put up any towers here, so I am not staying. My decision is motivated by a number of other factors and not just the noise.
I believe a lot of these problems in recent times are down to poor education around EMC.