I have just finished:
One Woman's War by Eileen Younghusband - an excellent biographical tale of one of the WAAF plotters / filterers who made Watson-Watt's radar really effective.
A few weeks ago, I read:
Britain's Shield: Radar and the Defeat of the Luftwaffe by David Zimmerman - details the development of Radar and how Watson-Watt and the extended team made it a reality. It also describes some of the competing systems that were being seriously considered.
The two books together tell a powerful story of technology working best when people get organised.
What have you just read?