The NRA brought the case against the WDA following a substantial fish kill. This was traced to a discharge of caustic soda from the Ynfmaerdy industrial estate, near Llantrisant. The leak apparently originated from a tank kept by one of the WDA's tenants, Kawneer (UK).
The NRA decided to prosecute the estate's owner, the WDA, which had built the estate and obtained a discharge consent for surface drainage water from the site. The prosecut