An articulation control assembly for a surgical instrument, the articulation control assembly comprising: a body ; a shaft assembly extending distally from the body, the shaft assembly including an articulation section , wherein the shaft assembly defines a longitudinal axis; an end effector located at a distal end of the shaft assembly, wherein the articulation section is operable to selectively deflect the end effector away from the longitudinal axis; a first articulation control member ; and characterised in that the articulation control assembly further comprises: a second articulation control member ; and a transmission assembly operatively connected to the body, the transmission assembly comprising: a high ratio drive , wherein the high ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a high rate of articulation in response to actuation of the first articulation control member, and a low ratio drive , wherein the low ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a low rate of articulation in response to actuation of the second articulation control member. a body ; a shaft assembly extending distally from the body, the shaft assembly including an articulation section , wherein the shaft assembly defines a longitudinal axis; an end effector located at a distal end of the shaft assembly, wherein the articulation section is operable to selectively deflect the end effector away from the longitudinal axis; a first articulation control member ; and characterised in that the articulation control assembly further comprises: a second articulation control member ; and a transmission assembly operatively connected to the body, the transmission assembly comprising: a high ratio drive , wherein the high ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a high rate of articulation in response to actuation of the first articulation control member, and a low ratio drive , wherein the low ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a low rate of articulation in response to actuation of the second articulation control member. a second articulation control member ; and a transmission assembly operatively connected to the body, the transmission assembly comprising: a high ratio drive , wherein the high ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a high rate of articulation in response to actuation of the first articulation control member, and a low ratio drive , wherein the low ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a low rate of articulation in response to actuation of the second articulation control member. a high ratio drive , wherein the high ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a high rate of articulation in response to actuation of the first articulation control member, and a low ratio drive , wherein the low ratio drive is configured to drive the articulation section to deflect the end effector from the longitudinal axis at a low rate of articulation in response to actuation of the second articulation control member. <EOS>