As anglers we have a unique insight into water quality issues; and if you’ve been watching the Paul Whitehouse TV program about our the state of rivers, you will see the importance, given the seeming lack of regulatory action, of some external [public] oversight of water company activities.
There is a petition on the UK Parliament’s website to raise the issue of public access to information on water quality/sewage discharges, which if you feel striongly about this matter you may wish to read and then sign.
https://petition.parliament.uk/petitions/633609