LONDON (Reuters) - A British man who had been held hostage by militants in Libya has been released, the British Foreign ****** said on Sunday David Bolam was freed days after the killing of a British hostage, aid worker Alan Henning, by Islamic State militants fighting in Iraq and Syria - the latest in a ****** of such executions that have been filmed and posted online. The Foreign ****** gave ** further details of who had held Bolam or how he had been released. ...