BS EN 1125 applies to panic applications where the exit door is used by the public and provides "safe and effective escape through the doorway with minimum effort and without prior knowledge of operation".
For example: theatres, schools, shops, hospitals, cinemas.

BS EN 179 applies to emergency applications where the exit door is used by people who "are familiar with the emergency exit and it's hardware and therefore a panic situation is unlikely to occur".
For example: a place of work, never accessed by the public or people unfamiliar with the escape drill.  This type of product should only be used in limited circumstances - be sure before you fit it!

We can help you with panic exit or fire exit devices in the bBedford area