Recent legislation allows waste treatment companies to pour raw sewage into british waterways - so I guess the seals/eels/salmon etc won't be sticking around for long...
The legislation isn't allowing something to happen that didn't happen before. There was a vote to ban it outright, which didn't pass. A watered-down (oh yeah) law was passed which allows the practice to continue but requires the water companies to work to prevent it.
Billions are being spent to make sure that doesn't happen.
...
'Initial assessments suggest that total elimination of discharges from storm overflows would cost anywhere between £150 billion and £650 billion.
This process could involve the complete separation of sewerage systems, leading to potentially significant disruption for homes, businesses and infrastructure across the country.'"
https://www.maldonandburnhamstandard.co.uk/news/19688229.joh...