Well its been an age since the original post, but a huge belated thank you to everyone who gave advice, especially Kme for pointing me in the direction of ESQCR.
After 2 years and 5 letters their claim against me is over now with them accepting half original amount. Interestingly If I hadn't made the early 50% offer I suspect they may not have taken me to court anyway. However once I made the offer I couldn't legally get out of it at a later date.
To all those asking why not let the insurance company pay for it. They told me they would pay as it wasn't worth disputing and my insurance premium would go up after the claim.
Other than given basic legal advice the solicitor wasn't of much use as they said it was too specialist and that I should contact my trade association legal team -which wasn't an option as I'm not a member of any.
Below are the relevant extracts from the letters I wrote that I believe caused them to back down.
What pissed me off about them claiming I was liable wasn't that I could have avoided it (in retrospect I could) but that they could have done also (see point 2 for how)
. Perhaps they didn't want it tested in court or perhaps it wasn't worth taking me to court for other reasons.
Anyhow thanks again. Here's the extracts below for anyone interested and in case anyone in the same situation finds this from a search and finds it useful.
You assert in your in your letter that I could have avoided damage to your cable by
making preliminary checks and using a cable detector. However, even if it were
found that my checks were insufficient that does not necessarily make me exclusively
liable as I am not the only party with responsibilities. My assertion is that the hidden
cable was a hazard and that anyone, for example, a householder putting a nail in the
wall to hang a picture, could have damaged the cable in the way that I did.
In my last letter (in the form of an email attachment sent on the 9th of August) I asked
you, how you had delivered on your statutory obligation (under ESQCR) 'to prevent
danger so far as is reasonably practicable' with respect to supply cables in situations
such as this.
I don't feel that you have adequately answered this question in your reply. Perhaps
my last letter to you was unclear. I shall endeavour to be more specific below and go
through your reply point by point.
You claim you did not plaster over the cable when you installed it. I do not dispute
this. You also claim that you are not liable for works after your initial installation and
that such works would have been done without your consent.
It was indeed these subsequent works that that made your cable a hazardous. Whilst,
I imagine, there are some circumstances under which you would not be liable for
subsequent works creating a hazard; it is also true that your statutory obligation to
prevent danger does not end when you finished the initial installation.
In the light of your statutory obligations, please can you answer the following
questions:
1) What is, and where can I find, the correct regulations governing how your supply
cables should be installed in peoples homes. Note, I cannot find this information in
the 17th Edition wiring regulations. For example, if one of your cables travels
through a wall are there specifications as to how deep the cable should be?
2) Given it is the case that your network sometimes runs inside people's houses. What
information have provided to people over the years to ensure that it doesn't become
hazard. For example, a householder is putting up some shelving on a wall where one
of your cables currently hangs exposed, he employs a carpenter to do the work and
requests the cable be covered up. Where would the reasonable carpenter or
householder go to find the specific information on how to safely cover your cable
correctly so that it doesn't become a hazard -- Presumably some coverings are
acceptable because I note that when renewing the damaged cable your contractors
placed the new cable in the existing wooden boxing. I think we can both agree that
hiding the cable in plaster is not the right thing to do, but how would the reasonable
householder or tradesman know this?
3)I think it is unlikely that this is the first time this has happened. How have the
Courts interpreted your statutory obligations as a network operator and mine, as a
tradesman, in the past in situations such as this - with specific reference to supply
cables inside people homes.