Registers
19. Nothing in regulation 16 or 18 shall require an enforcing authority to keep in a register maintained by him—
(a)monitoring information relating to a particular process four years after that information was entered in the register; or
(b)information relating to a particular process which has been superseded by later information relating to that process four years after that later information was entered in the register,
but nothing in this regulation shall apply to any aggregated monitoring data relating to overall emissions of any substance or class of substances from prescribed processes generally or from any class of prescribed process.