As from yesterday, I cannot connect at all to the internet, where as it was working fine prior. 

It is set to BT_VDSL and as I said was fine. Then suddenly its asking for manual DNS configuration.

The line works fine as when I use the BT Smarthub, there are no issues. 

So something has happened to the VR900. 

Steps i've taken are 

1) Updated to latest firmware from TP Link site.

2) Hard reset.

Neither have helped.

LED lights are ALL on white, showing DSL connection is active. As I said, the line is not to blame.