In a video showing the purported murder of Mr Sotloff, the killer showed the hostage, described as British. Mr Cameron said: "This country will never give in to terrorism. Our opposition to ISIL (Islamic State) will continue at home and abroad.
"It makes no distinction between cultures, countries and religions. There is no way to appease it; the only way to defeat it is to stand firm and to send a very straightforward message. A country like ours will not be cowed by these barbaric killers. If they think we will weaken in the face of their threats, they are wrong; it will have the opposite effect."
