I have isolated the fault to an area of a room but there is no access at all !
I know there is always a logical explanation for faults but given the size of the property and how unorganised it is its completely unrealistic for anyone to suggest they would find it in a day,without seeing it as they have been claiming!
Earth leakage meter is not something Ive needed before, our installs are almost all brand new and tested accordingly
As mentioned before i wouldn't normally delve into fault finding this much but I've kind of inherited this problem.