Sect 3 Chp1 page 9
9.8 Self-positioning of aircraft
9.8.1 Controllers should exercise caution when approving self-positioning to final approach and are not to initiate reference to the 'Centrefix' or other locally used term.
9.8.2 If controllers are in any doubt about the location of the 'Centrefix' or other position referred to by a pilot, they are to ask the pilot to define this position and take this definition into consideration when carrying out their controlling duties.
It works too, although some ATCO's dont like it "cos its not an approved procedure".
