By John Stevens Labour has declared victory in London as Sadiq Khan is set to be re-elected as the capital’s mayor. After he took an early lead in the first areas to declare results, party sources have said they are confident he will win an historic third term. Mr Khan has won praise for his introduction of free school meals for all primary school pupils in London. But he has faced controversy for his expansion of Ulez. The Ultra Low Emission Zone, which sees drivers of the most polluting vehicles made to pay a daily charge, was extended to cover all 33 boroughs of Greater London last August. …