I've woke up to a blue light and the return of internet... on the same day BT presumably returned to work. Went live again around 8.40am
Surprised to see no one else has reported the same.
My connection is still down, too.
But the fact that some connections have come back is reassuring. It shows that somebody somewhere has some idea of the cause.
Yes perhaps it's a manual fix for us all but the fact it was fixed the moment you'd expect someone to arrive in the office suggests it's probably not coincidental.
EDIT: After an hour it's gone down briefly again. Spoke too soon. Message in log was 'OpenRG will go down for reboot in 5 seconds'. It's back again, still getting more internet than I've had all Christmas.