Thank you @Coppice, I clarified better my OP.
In the previous place the router needs login details to the Plusnet account in order to have access to the internet. And the same I found in any other places I have been. But Utilities Wearhouse does not. Surely that's not right...
BTW, I am not talking about WiFi, just the wired broadband. i.e. for the wired router to access the internet (copper connection to the cabinet then fiber from the cabinet onwards).