Charlie
I have also spoken at length to Phil at R and R, and like Grant I have no doubt that he's the person to set up the the ZF LSD for the seven (he does them for CC), and his charge is reasonable. Generally, he finds the diff bearings can be reused, so this is a potential saving. Interestingly, he felt that the Quaife unit was not suited to the seven at all . He and CC have been fitting the ZF unit in sevens for a long time.
Malcolm