Simon Bird, the boss of the Bristol Port Company has told a committee of MPs that building a barrage across the Severn estuary could be a "killer" to his business.
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Weather warnings are in place as Storm Imogen brings winds of up to 80 miles per hour.
Winds of nearly 80mph have been reported at Avonmouth as Storm Imogen arrives in the west.
After a weekend of heavy rain and high winds, the West Country has been told to brace for another bout of bad weather.