BT Smart Hub and Ultrafast Smart Hub - WPS Button Flashing Blue
How to fix problem:
Press the Wi-Fi Protected Setup (WPS) button on your hub to reconnect. You must do this within two minutes of your hub flashing.
If you have a WPS button on your computer or device also press this.
Your hub will return to normal mode with no flashing light after a few minutes. If your hub flashes red you didn't reconnect -
give it a few minutes and try again.