An adaptor for mounting a refuelling hose and drogue arrangement to a refuelling boom of an aircraft is arranged to provide fluid communication between the boom and a hose of the hose and drogue arrangement. The adaptor is also arranged such that the hose is movable with respect to the boom. The adaptor includes an actuator arranged to produce a biasing force on the hose, and arranged for affecting movement to adjust the position of the hose in relation to the boom.