Upgraded to fibre lost internet

[#1]

Upgraded yesterday, 7 Sept 2020, due to begin today, no internet this morning.
Red light on router.
Unplugged everything, checked connections, reset everything - no difference.
Tried settings on 192.168.1.254, no difference.
Any help or advice appreciated.
(Keyworker working from home)

[#2]

Thanks for taking my call @Stevie777, I am glad to hear this is now sorted. Please don't hesitate to get back to us should you have any further queries.