HMS Victory will be formally dedicated as the flagship of the First Sea Lord, Admiral Sir Mark Stanhope in a special ceremony in Portsmouth later.
The ship is being granted the honour following a reorganisation of the top tiers of the Royal Navy.
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A number of teenagers, aged 13 to 15, from Portsmouth, have been treated in hospital, after taking tablets believed to be diazepam.
Thursday Evening's Pollen Forecast
Thursday night's weather for the east of the region