The Guardian Angels - made up of police, social workers and Barnardo's - will speak to vulnerable young people and respond to any reports of abuse.
Winslet At Launch Of 3D Titanic Film
Oscar winner Kate Winslet will walk the red carpet tonight at the re-launch of the 3D version of the film that made her a star.
She will be joined by co-star Billy Zane and director James Cameron at the Royal Albert Hall in Kensington, west London, for the premiere of Titanic in 3D.
Cameron is expected in London fresh from the success of his latest venture.
He used a specially designed submarine, called Deepsea Challenger, to dive nearly seven miles below the surface of the Pacific.
He reached the ocean's deepest point on Earth - a place where only two men had gone before - early on Sunday, local time.
The descent took him to the Mariana Trench, about 200 miles south west of the Pacific island of Guam.
The new Titanic release comes 15 years after the original film was a huge hit, pulling in billions at the box office and winning 11 Oscars.
Winslet, who won a Best Actress Oscar in 2009 for The Reader, played sensitive socialite Rose DeWitt Bukater alongside Leonardo DiCaprio's Jack Dawson in the epic drama.
The couple's doomed love affair on board the ill-fated boat has been converted into 3D 15 years after the film was originally released.
''The 3D enriches all of Titanic's most thrilling moments and its most emotional moments.
''More than ever, you feel you're right there going through all the jeopardy that Jack and Rose go through. The 3D kicks the whole experience up to another level.''
More than 1,000 people died when the Titanic sank after hitting an iceberg on its maiden voyage in 1912.
The story of the ship, which was on its way from Southampton to New York, has inspired countless books and films and a new mini series made by Downton Abbey writer Julian Fellowes has just debuted on ITV.
The car failed to stop after an 88-year-old man was seriously injured near Winchester.
Daniel McBride's been sentenced to life for killing a "vulnerable'' woman who died of internal injuries.
Racing was cancelled on Sunday after winds reached 30 knots - on the day Prince William and Kate went to watch.
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