“The mistake that was made in this case was a fundamental one in the setting up, the testing and the subsequent monitoring of the equipment. That such a basic mistake could possibly occur in what needs to be an industry managed and operated with scrupulous care for public safety and the environment is bound to be a matter of grave concern to everyone and particularly local residents in Cumbria. What adds significantly to the concern and the seriousness of the mistake is that it had been in existence and allowed to go undetected for the period of 4 months or so that the system had been in use.”