Andy Richards of the Unite union says there is "significant" public support in Wales for the Severn barrage. He said it was time to move on from the "scaremongering" and start to examine the detail of the proposal by Hafren Power, the firm behind the scheme.
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The evening will stay cloudy with drizzle and fog in hilly areas.
There will be early evening sunshine with a few patches of rain later on.
The Avon fire service has moved its headquarters from Bristol to share Avon and Somerset Police's Portishead base.