Good Morning Graemeg1,
Thanks for your post on our Community Forums and a very warm welcome to you!
Sorry to see you've been left without a dial tone since Friday.
There doesn't currently appear to be an outage in your local area. Can you please advise me of your set up at home?
-Have you attempted an alternative handset?
-Do you have multiple pieces of equipment plugged in?
-Is your landline phone plugged into the master socket or an extension socket?
Kindest regards,
David_Bn