The Metro newspaper because it's a free newspaper that a large majority of Londoners read every morning and a lot of young people read it on their commute to work or college. It often contains a wide range of topics such as politics to local events happening in London; it also has a t.v listing guide which may be very helpful.
I also considered Live magazine because it's a youth based magazine and is directed at our target audience and also has a 'In deep' section that promotes the awareness of issues such as knife crime, which fits in with our documentary topic.