(b) "Y" Service and I.W.I.S. We do not consider it feasible to uproot the whole of the I.W.I.S. Organisation, despite the inconvenience that may result from the distances likely to be involved. Development has already gone so far that the dislocation involved in making a major change would not be acceptable. It must, however, be recognised that a heavy burden will be laid on communications as a result of this necessary separation. Interception is not dealt with in this paper since it must be arranged on a general plan, irrespective of the headquarters concerned.