Originally published in The Express
The news emerges as Whitehall prepares to send 50 additional SAS and SBS troops to join the fight against the terror group in Iraq.
Another 120 Special Forces support troops are also being considered.
They are to help Peshmerga, the military forces of Iraqi Kurdistan, advance further into Syria. Kurdish forces have already established coalition enclaves just hours from Raqqa, the headquarters of IS.
Douglas Murray, of the British-based Henry Jackson Society think tank, said: “There is no reason why an increased number of Iraqi Special Forces, combined with outside Special Forces giving more accurate call-ins to a stepped-up aerial campaign, could not turn things around.