So who got it wrong!
1) At some point a Plumber must have fitted the bath without bonding.
This kind of thinking is an embarassment to the electrical profession - some people always conjure ways of blaming someone else.
But it says a combination of faults so likely many others have also missed things.
Perhaps some electricians?
The no earth scenario is all too common where originally the water, gas, oil etc. would have given a property an earth. At some point work likely by non electrical personal has removed the earth.
So are there no bad electricians anywhere in the kingdom?
OK it could be an Electrician but you and I both know that builders, plumbers, kitchen fitters and home owners all in the past would have a go. From what is said in papers an electrician was commissioned to test the house but they moved in before it was completed and plugged in a faulty appliance.
As to why they moved in before the house was ready we don't know. But we are told he was aware of some short comings on the electrical circuits but did nothing himself to protect against this but just waited for the electrician.
For someone who had no idea there was anything wrong to offer the house for rent may not be correct but understandable but for someone who admits there was something wrong to move in anyway is questionable.
Yes I know we have all done it. In 1990 I got two RCD's for my house and it took me a year to get around to fitting them. Which was due to pressure from my father-in-law who pointed out I would not forgive myself if anyone got injured and I had not done it. I was lucky no one got injured in that year and yes after that time my son did manage to trip them on a few times due to making mistakes with his Amateur Radio hobby.
In commercial premises all items are PAT tested and had his items been PAT tested the fault would have been likely found. But we don't PAT test domestic items so many be the call by coroner should have been for PAT testing to have been carried out on all items when people move them from house to house?
Even when the HSE visit a site it is common for owners to be given time to correct faults except where very bad. And when it comes down to it northing was really done wrong by either landlord or tenant it was just unlucky that the accident happened before the electrician had the time to check it.
I would say no one was really to blame. And everything was being done as it should have been. And however much we try to learn lessons from it as reported there is very little to learn as all that should have been done was commissioned to take place. And it is very hard to say they should not have moved in as we all know once the wheels start to move it is hard to delay things once one has given notice to move out of a house often you can't delay it as new tenants have found.
And now with Part P one can't so easy find Electricians willing to do work now often one has to wait.