We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
Sounds like it was contractors who turned up to dfo the instal.
You'd have the same problem with Sky as they use the Openreach infrastructure as well.
Let's hope all goes well on the 15th.