The problem you have is trying to make the irresponsible managers you are working under aware of their responsibilities to the client when the client has deferred their duty of care to them
Unfortunately you as the guy on site carying out the I & T and signing the certificate are first in the line of fire should an incident involving the installation you have tested occurs, after that we move onto who is checking and / or authorising the certificate and do they fully understand their responsibilities and potential liabilities
The problem you are hoping to resolve is not just limited to the company you are working for and is really an industry wide issue where the quality of I & T widely varies and ultimately comes down to cost and a lack of understanding on the clients part of what they are actually purchasing with the possession of a satisfactory certificate being sufficient to satisfy H & S requirements they are not bothered that the quantity of circuits tested within X hours, days or weeks is actually achieveable to a reasonable to high standard
Personally I think you have little or no chance of changing (as you call them) the idiots attitude to responsible and ethical I & T and it would probably be a lot easier and less hassle to seek employment elsewhere rather than banging your head against the wall.
