johny99: Chorus assume the risk of this occurance,if their cost to charging analysis are out of alignment they need to look at it, what is W&M for, i always believed this was insurance for exactly this problem.
Wiring maintenance covers wiring within your premises (ie past the demarc). This wiring in your premises and is owned by you. Wiring maintenence is effectively an insurance policy that will cover replacement of existing wiring with like should a fault arise. Wiring maintenence isn't required, and you can easily get a a data installer or electrician do to the same work if required.
Wiring on the other side of the demarc is the Chorus network. This includes the leadin to your home whether it be an overhead drop or trenched underground.