Diana's husband Adam told ITV London that the public need to stand up and say "this isn't good enough."
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14-year-old Joshua Mould has learning difficulties and struggles to communicate.
David Haines' daughter tells ITV News families of IS victims will not get closure until there is a "bullet between the eyes" of Jihadi John.
The Essex boy will be racing for a new team - Manor - after the team formerly known as Marussia came out of administration.