Minister for Portsmouth Michael Fallon will be launching a new plan in the city aimed at creating jobs and boosting growth.
The plan has been put together to help the marine and maritime industry in the Solent following BAE Systems' announcement it would stop ship-building in the city.
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A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The government will make an announcement about whether Heathrow or Gatwick should be awarded a new runway at 12.30pm today.
Tuesday morning's weather for the west of the region