Actuator assembly

An actuator assembly comprising:

• a first part, wherein a first axis is defined with reference to the first part and the extent of the actuator assembly along the first axis is less than the extent of the actuator assembly along any axis perpendicular to the first axis;
• a second part which is movable relative to the first part;
• a drive arrangement configured to rotate the second part about the first axis and to rotate the second part about a second axis perpendicular to the first axis;
• and
• a bearing arrangement configured to allow rotation of the second part about the first and second axes, to constrain rotation of the second part about a third axis, and to constrain movement of the second part along the third axis, wherein the third axis is perpendicular to the first and second axes;
• wherein the bearing arrangement is configured to constrain movement of the second part in a first direction along the first axis;
• and
• the actuator assembly is configured to produce a biasing force on the second part that constrains movement of the second part in a second direction along the first axis, wherein the second direction is opposite the first direction.