A surgical endoscope for manipulation by a surgical robot arm. The surgical endoscope comprises a shaft having a distal end for insertion into a patient and a proximal end. An endoscope interface is attached to the proximal end of the shaft. The endoscope interface is configured to engage a robot arm interface of the surgical robot arm. The endoscope interface comprises an endoscope wedge mechanism moveable between an unlocked position and a locked position. The endoscope wedge mechanism comprises endoscope wedge elements which are displaceable such that collective displacement of the endoscope wedge elements actuates the endoscope wedge mechanism between the unlocked position and the locked position.