This is the front cover of a glossy magazine which HMS Collingwood put out every QUARTER as the "NAVAL RADIO REVIEW". It was confidential and was given the identity of CB (Confidential Book) 3158. This edition is Vol 1 No 1 dated March 1947.

The following link will take you to an article from this magazine which tells of the situation post WW2 in 1947, an what is to come in the forseeable future. 1947 Communications Review.