The UK will take 'whatever steps are necessary' to defend itself in the wake of the murder of British aid worker David Haines, according to the Prime Minister.

David Cameron's described the Islamic State militants who killed him as 'monsters'.

Meanwhile a second Briton being held hostage by IS has been named this afternoon as another aid worker - 47 year-old Alan Henning.

Sky's Senior Political Correspondent Jon Craig, who's at Downing Street, has seen a photo of him.