An aircraft wing, the aircraft wing comprising a fixed wing and a wing tip device rotatable about a hinge at the tip of the fixed wing, wherein the wing tip device comprises a moveable element that moves along a path, relative to a stationary structure at the tip of the fixed wing, when the wing tip device is rotated about a hinge axis of the hinge, between: (i) a flight configuration for use during flight and (ii) a ground configuration for use during ground-based operations, in which ground configuration the wing tip device is moved away from the flight configuration such that the span of the aircraft wing is reduced, wherein the wing further comprises a hinged panel at a boundary between the wing tip device and the fixed wing, and the wing is arranged such that: in the flight configuration the hinged panel is closed such that the hinged panel is substantially flush with an upper surface of the wing, and the hinged panel is located in the path of the moveable element, and in the ground configuration the hinged panel is hinged open to a position outside the path of the moveable element such that clashing of the moveable element with the stationary structure at the tip of the fixed wing is avoided and characterised in that the hinged panel is hinged open as a result of the moveable element exerting an opening force against the panel as the wing tip device moves to the ground configuration, and in that the wing further comprises an actuation mechanism for moving the wing tip device from the flight configuration to the ground configuration, and the actuation mechanism comprises the moveable element. wherein the wing tip device comprises a moveable element that moves along a path, relative to a stationary structure at the tip of the fixed wing, when the wing tip device is rotated about a hinge axis of the hinge, between: (i) a flight configuration for use during flight and (ii) a ground configuration for use during ground-based operations, in which ground configuration the wing tip device is moved away from the flight configuration such that the span of the aircraft wing is reduced, wherein the wing further comprises a hinged panel at a boundary between the wing tip device and the fixed wing, and the wing is arranged such that: in the flight configuration the hinged panel is closed such that the hinged panel is substantially flush with an upper surface of the wing, and the hinged panel is located in the path of the moveable element, and in the ground configuration the hinged panel is hinged open to a position outside the path of the moveable element such that clashing of the moveable element with the stationary structure at the tip of the fixed wing is avoided and characterised in that the hinged panel is hinged open as a result of the moveable element exerting an opening force against the panel as the wing tip device moves to the ground configuration, and in that the wing further comprises an actuation mechanism for moving the wing tip device from the flight configuration to the ground configuration, and the actuation mechanism comprises the moveable element. in the flight configuration the hinged panel is closed such that the hinged panel is substantially flush with an upper surface of the wing, and the hinged panel is located in the path of the moveable element, and in the ground configuration the hinged panel is hinged open to a position outside the path of the moveable element such that clashing of the moveable element with the stationary structure at the tip of the fixed wing is avoided and characterised in that the hinged panel is hinged open as a result of the moveable element exerting an opening force against the panel as the wing tip device moves to the ground configuration, and in that the wing further comprises an actuation mechanism for moving the wing tip device from the flight configuration to the ground configuration, and the actuation mechanism comprises the moveable element.