Moazzam Begg, who was recently released from prison after new evidence exonerated him from terrorism charges, wrote the following appeal to ISIS leader Abu Bakr al Baghdadi for the release of British citizen Alan Henning .
Begg wrote the letter whilst still detained in Belmarsh jail. He approached the Foreign Office to facilitate this appeal but they refused to assist and thus the letter never publicly went out.
Henning was subsequently beheaded.