An electrospray head for use in an electrospraying apparatus comprises a body with an internal surface defining a conduit having an inlet for receiving a fluid to be sprayed and an outlet for emitting the fluid. A movable wall forms a part of the internal surface defining the conduit, the movable wall being arranged to constrict or dilate the conduit upon operation of the actuator. The movable wall can thus control the delivery of fluid through the outlet from the conduit.
