Colin Parry, whose son Tim died in an IRA bomb blast in Warrington in 1993, has welcomed a meeting between the Queen and Martin McGuinness.
Mr Parry said the historic handshake with the former IRA commander, was a sign of how much progress was being made in the Northern Ireland peace process.
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The footage, taken from a dead Islamic State militant, shows the fighters in a chaotic and panicked battle with Peshmerga forces.
Solicitors acting for 20 of the families said they were "appalled to see the shambles in South Yorkshire Police" following the inquest.