"We continue to work closely with the Ministry of Defence to explore all possible options to determine how best to sustain the capability to deliver complex warships in the UK in the future.
"This work is ongoing and we are committed to keeping our employees and trade unionsinformed as it progresses."
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Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
Causes are thought to be climate change, fisheries, disease, and pollution.