5. We have decided therefore that all demands for information from these two organisations shall in future be made as under:(a) Demands on the Inter-Services Topographical Department will be made through:Commander G.P. Slade, R.N.V.R., N.I.D.17, Admiralty. Telephone No: Admiralty, Ext. 424 (Green Line 211). Or in his absence through: D.D.N.I.(F). Admiralty, Etx. 102 (Green Line 23). (b) Demands on the Central Interpretation Unit will be made through:Group Captain P.G. Stewart, A.D.I.(Ph.), Air Ministry.