In any case, the 'cunning plan' means that controllers at each radar unit can tell which unit is working a particular aircraft and thereby can co-ordinate if necessary...
Which, of course, is only necessary because of the UK's rather quaint departures from (or interpretations of) SARPs and the somewhat fragmented and uncoordinated system that is used within the State. But I guess it must be the rest of the world that's doing wrong
.