A video has been released on the internet by the jihadist group ISIL which it is claimed shows the British aid worker Alan Henning being beheaded.<br /><br />The extremists had been holding him since last December when he went to Syria to help the relief effort.<br /><br />ISIL had threatened to kill the Briton in a video showing the execution of British hostage David Haines.<br /><br />Earlier this week Alan Henning’s wife had appealed for his release.<br /><br />According to the SITE monitoring group the latest video also shows an American aid worker who is being held hostage.<br /><br />Britain said on Friday that if a video showing the beheading of British citizen Alan Henning by ISIL militants fighting in Iraq and Syria was genuine, then it was a disgusting murder.<br /><br />“We are aware of the video and are working urgently to verify the contents,” a spokesman for the British Foreign Office said.<br /><br />“If true, this is a further disgusting murder. We are offering the family every support possible; they ask to be left alone at this time.”