Krypton John - the TR blade that is nearest to the MR is the one that is most affected by the MR down wash and it is this one that needs to be going upwards into the downwash to give max V squared.
As old beefer said, it made a huge difference to the TR effectiveness on the Lynx, from something that would often pirouette at high power to something that can deal with 120 deg per sec and beyond rates of yaw and remain controllable.