GE671 - Grayston Harness Cutter.
 
These simple, lightweight harness cutters meet the Motorsport UK requirement for R48.10.11. We recommend attaching one to the side of the drivers seat mount using velcro or a very thin tie-wrap so both drive and navigator can reach if required. 
 
We prefer these to the heavier "Hammer" style ones because if they do become detached in a major accident, there is less chance of injury. 
 
If using a tie-wrap, ensure it is really small one that driver/navigator can snap if required.