A subsea wellhead assembly disposed over a wellbore, the wellhead assembly comprising: a tubular wellhead member; a production tree that lands on the tubular wellhead member; a tubing hanger landed in the tubular wellhead member; a control line passage in the production tree; a control line passage in the tubing hanger; a stab member at least partially circumscribed by the tubular wellhead member that extends between the production tree and tubing hanger; and a control line passage in the stab member in fluid communication with the control line passage in the production tree and in selective fluid communication with the control line passage in the tubing hanger, the assembly further comprising: an annular casing hanger landed within the wellhead member with the annular tubing hanger landed at least within a portion of the casing hanger; characterised by the stab member having lower side that engages the tubing hanger upper end and an upper side that engages the production tree lower end; the control line passage in the tubing hanger having an open upper end that exits the tubing hanger on an upper portion of the tubing hanger; the control line passage in the tree stab member registerable and in selective fluid communication with the end of the tubing hanger control line passage exiting on the tubing hanger upper portion; and the wellhead assembly further comprising a circular channel on the surface of the tree stab assembly facing the tubing hanger generally coaxial with the tubing hanger upper end and having an outer wall angling radially outward, the upper end of the tubing hanger being beveled on its outer periphery to correspond to the channel outer wall, so that when the tubing hanger upper end is inserted into the channel, the outer wall and beveled outer periphery contact to form an interface surface across which the tubing hanger and tree stab control line passages (84, 78) register. a tubular wellhead member; a production tree that lands on the tubular wellhead member; a tubing hanger landed in the tubular wellhead member; a control line passage in the production tree; a control line passage in the tubing hanger; a stab member at least partially circumscribed by the tubular wellhead member that extends between the production tree and tubing hanger; and a control line passage in the stab member in fluid communication with the control line passage in the production tree and in selective fluid communication with the control line passage in the tubing hanger, the assembly further comprising: an annular casing hanger landed within the wellhead member with the annular tubing hanger landed at least within a portion of the casing hanger; characterised by the stab member having lower side that engages the tubing hanger upper end and an upper side that engages the production tree lower end; the control line passage in the tubing hanger having an open upper end that exits the tubing hanger on an upper portion of the tubing hanger; the control line passage in the tree stab member registerable and in selective fluid communication with the end of the tubing hanger control line passage exiting on the tubing hanger upper portion; and the wellhead assembly further comprising a circular channel on the surface of the tree stab assembly facing the tubing hanger generally coaxial with the tubing hanger upper end and having an outer wall angling radially outward, the upper end of the tubing hanger being beveled on its outer periphery to correspond to the channel outer wall, so that when the tubing hanger upper end is inserted into the channel, the outer wall and beveled outer periphery contact to form an interface surface across which the tubing hanger and tree stab control line passages (84, 78) register. an annular casing hanger landed within the wellhead member with the annular tubing hanger landed at least within a portion of the casing hanger; characterised by the stab member having lower side that engages the tubing hanger upper end and an upper side that engages the production tree lower end; the control line passage in the tubing hanger having an open upper end that exits the tubing hanger on an upper portion of the tubing hanger; the control line passage in the tree stab member registerable and in selective fluid communication with the end of the tubing hanger control line passage exiting on the tubing hanger upper portion; and the wellhead assembly further comprising a circular channel on the surface of the tree stab assembly facing the tubing hanger generally coaxial with the tubing hanger upper end and having an outer wall angling radially outward, the upper end of the tubing hanger being beveled on its outer periphery to correspond to the channel outer wall, so that when the tubing hanger upper end is inserted into the channel, the outer wall and beveled outer periphery contact to form an interface surface across which the tubing hanger and tree stab control line passages (84, 78) register.