Campaigners criticise report into Camelford water poisoning

About 22 years ago the issue of Camelford came up as I conversed with an elderly (70 odd year of age) female patient. She told me she once worked for the then public utility Yorkshire Water and knew of an "accidental" spillage similar to Camelford that occurred during her tenure for which, although a report could be found in the relevant records, it was not made public.
Could anyone confirm this?