The wife of a British taxi driver being held hostage by Islamic State jihadists implored his captors to release him, saying Saturday she could not see how his death could assist any cause.Alan Henning, a Briton who volunteered to drive a humanitarian aid convoy to Syria for a Muslim charity, was captured 10 months ago and is in the hands of the IS group. In a statement released through Britain’s Foreign Office, Barbara Henning urged his captors to ‘see it in their hearts to release my husband’, given the circumstances in which he was in Syria.The 47-year-old father was shown in the same video released a week ago that documented the murder of fellow Briton David Haines.