They're here almost every week in our lane. Usually two vans and sometimes a cherry-picker thing to get up to the top of the pole.
Swapping the knackered old pairs around would appear not to have been successful, so it looks like they have cut about 500m from the line length by routing the cables under the road at the entrance to the lane rather than have them go down to Manderley and back up the other side if that was the original route. Doing this in stages connecting the various bits back together perhaps.
I'd like to think they ran fibre in preparation for FTTP but in all likelihood it's probably just more copper. Such a wasted opportunity and a very expensive (8 visits so far with multiple engineers?) way of not providing superfast broadband. Though FTTP would require fibre to be dragged from the connection point at the cabinet to the properties, some of that being underground.
Though I wonder why they're doing this work at all rather than just telling the ISP "that's all the line is capable of". Suggests perhaps a more serious failure e.g. cable fractures or breaks leading to problems with calls.