Abstract: A grout delivery system for delivery of grout to a downhole location within a borehole. The grout comprising a settable mixture of first and second flowable components. The grout delivery system is adapted to be conveyed to the location within the borehole to which grout is to be delivered and to be subsequently retrieved. The delivery system comprises a delivery head, a first reservoir for receiving a charge of the first component, and a second reservoir for receiving a charge of the second component. The delivery system is operable to cause supplies of the first and second components to be conveyed to a mixing zone at the delivery head where they are mixed to form the grout and delivered into the borehole.