An aircraft wing, the wing having a fixed wing with a wing tip device moveably mounted at the tip thereof, wherein the fixed wing has an upper surface and a lower surface, and the wing tip device has an upper surface and a lower surface, and the wing tip device is operable between: (i) a flight configuration for use during flight, in which configuration the upper and lower surfaces of the wing tip device are continuations of the upper and lower surfaces of the fixed wing; and (ii) a load alleviating configuration for load alleviation during flight, in which configuration the wing tip device is moved relative to the fixed wing such that at least one of the upper and lower surfaces of the wing tip device is moved away from the respective surface of the fixed wing, and the load on the wing is reduced; characterised in that the aircraft wing comprises a restraining assembly operable between a restraining mode in which the wing tip device is held in the flight configuration using a restraining force, and a releasing mode in which the restraining force on the wing tip device is released, such that the wing tip device is able to adopt the load alleviating configuration, and wherein the wing comprises a biasing member, arranged such that when the wing tip device is in the flight configuration, the biasing member exerts a biasing force to urge the wing tip device towards the load alleviating configuration. wherein the fixed wing has an upper surface and a lower surface, and the wing tip device has an upper surface and a lower surface, and the wing tip device is operable between: (i) a flight configuration for use during flight, in which configuration the upper and lower surfaces of the wing tip device are continuations of the upper and lower surfaces of the fixed wing; and (ii) a load alleviating configuration for load alleviation during flight, in which configuration the wing tip device is moved relative to the fixed wing such that at least one of the upper and lower surfaces of the wing tip device is moved away from the respective surface of the fixed wing, and the load on the wing is reduced; (i) a flight configuration for use during flight, in which configuration the upper and lower surfaces of the wing tip device are continuations of the upper and lower surfaces of the fixed wing; and (ii) a load alleviating configuration for load alleviation during flight, in which configuration the wing tip device is moved relative to the fixed wing such that at least one of the upper and lower surfaces of the wing tip device is moved away from the respective surface of the fixed wing, and the load on the wing is reduced; characterised in that the aircraft wing comprises a restraining assembly operable between a restraining mode in which the wing tip device is held in the flight configuration using a restraining force, and a releasing mode in which the restraining force on the wing tip device is released, such that the wing tip device is able to adopt the load alleviating configuration, and wherein the wing comprises a biasing member, arranged such that when the wing tip device is in the flight configuration, the biasing member exerts a biasing force to urge the wing tip device towards the load alleviating configuration.