@Toddycool wrote: Sorted! You led me down the right path! It turned out that the cable to the homehub had been caught and one of the wires had broken. Swapped it out and it came good! I assumed it was the faceplate as it had been knocked but all good now. Thanks for all your help!
A damaged cable would have created a short circuit, which is why plugging the lead to the home hub in, stopped dial tone.