> cable replacement programme failed to fix the issue.
That sounds like the typical runaround you'll get from network engineers in the UK. It's shameful that an entire village was without proper internet for 18 months. You might think "what does it matter", but remember people run internet businesses or keep in touch with family & friends. Imagine how bad this situation would be for folks during COVID.
For myself the internet used to go down for days at a time, perhaps every couple of weeks. We had BT of speed-dial and knew how to get through the bot automation by mashing the keypad. For maybe 5 years we asked for this to be repaired and got the usual "it must be your system" or "unusually high traffic" - sometimes they would send an engineer down to try and sell us some hardware we didn't need. We even got a business line, but BT couldn't keep that going either.
Eventually we even started collecting signatures of local people willing to buy a fiber internet connection if we paid for one to be fitted and pretty much everybody backed it. Initially we were only asking local businesses, but the demand was high from everywhere. We only needed something like 10% of users to buy in to cover the original costs. After this BT was suddenly motivated to fit fiber and because of the preparations we had begun to make, it was fitted just outside our house.