From the Guardian, some good news, the Severn Barrage project has definitely been shelved -
" Tide goes out for Severn Barrage"
Unfortunately the reason for this decision is purely down to lack of funds rather than a concern for the rivers. Whether it merely delays the inevitable or allows some more time for new thinking the delay offers some breathing space for environmentalists to come up with some better proposals for harnessing the energy of the tides in the estuary.
Beautiful at low tide, just as the Taff estuary was prior to the barrage being built there