Former Metropolitan Police Commissioners Lord Condon and Lord Stevens are due to give evidence to the Leveson Inquiry. Surrey Police Chief Constable Lynne Owens is also set to appear.
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Initial indications were that the test on Friday was unsuccessful, according the a US government source who spoke to Reuters.
Southerly winds will bring warmer temperatures this weekend. Rain arriving on Sunday.
A cancer-stricken young father who may have just weeks to live says he refuses to "roll over and die" - and has launched an appeal for help.