Most Secret War
Masterly account of the radar war 39/45 and much more. Recently re-issued Professor RV Jones RAF's head of scientific intelligenge from 1938 onwards Penquin ISBN 978-0-141-04282-4
He has little time for Robert Watson-Watt
Original pub date 1978 the updated version expands on some chapters of the previous work especially the origins of the Oslo Report, read and be amazed.