Pollution is out of control and the regulator is "not fit for purpose" river and fishing groups claim.
Marie Baltazar was secretly filmed by a member of staff at the home she worked in.
Eleven young people get behind the scenes experience on Michael Sheen's new film set in Wales.
Watch live BBC Two Wales coverage as Cardiff Blues face Zebre in the Pro12 at Cardiff Arms Park.
Promoted Newcastle still have slim hopes of winning the Championship title - follow live text coverage of their game at Cardiff.
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