Lets see what moving the cabinet the 150m from our estimated position to the google maps lat/lng position makes.

There's something profoundly wrong. I sync at 58mbps and I'm 650 metres from the cabinet (albeit after optimising domestic wiring).

ah! I see it
FTTC Fibre based broadband may be available to you, but speeds are likely to be under 24 Mbps.

I have spent a lot of time and effort in getting everything top notch in my wiring.
When I moved here My netgear modem would'nt even sync with the line ! I gradually nursed it up to 2.5 mbs

40% is within vendor testing for crosstalk but is at the upper range of the lottery. Sadly it seems you have just been unlucky in that lottery.

With that said I think your line would fail a GEA test given how much you have lost in a short space of time. Which should merit at least an investigation.

Could you explain what a GEA test is please.

Oh BTW my upload has been a very nice 5.1mbs ever since Fibre was installed.
It dropped down to 3mbs today I don't know what the hell is going on!

GEA is Openreach "Generic Ethernet Access", which is its product available to Communications Providers wanting to use its FTTC/FTTP and related products. Example.

A GEA test will be an Openreach test, possibly available for CPs to use in the same way as other line checks they can do.

Thanks for that
I reckon I'll be back in about 6 months after I get a head transplant. and then read it LOL

It used to be a lot shorter and simpler. Keeping up with every three months of changes and additions takes more effort than learning the basics that it started as. And that is just one BT SIN. Google BT SIN INDEX and look at the list.

Thanks I'm trying to get my head round at least some of it.

My neighbour who was having her VDSL dropout when the phone rings has had Openreach here all day ! trying to find her a decent line in the copper from the cabinet.Apparently he said that the cable is in a bad way and there are split pairs being used including hers. She says her line is ok now though and getting speeds a little faster than mine.
I don't know if she is now on a proper pair or not I just hope he didn't swap it with mine lol