This chapter examines first the gradual infiltration of logical empiricism into British philosophy during the 1930s, mainly through lectures by Schlick and Carnap, and not necessarily in accordance with Neurath’s ideas. L. Susan Stebbing played an important role as mediator, although she reflected on differences between the Viennese and the British analytical approaches. A. J. Ayer’s bestselling book Language, Truth, and Logic prepared the ground to some extent, but, by the time Neurath arrived to give a series of lectures at Oxford University, philosophers were mostly absent serving in the war. Neurath’s lectures are reconstructed from his notes, and the changes and developments in his philosophy of science are examined, also with reference to his monograph Foundations of the Social Sciences. We show that Neurath’s late work adapted to British sociological and anthropological thinking, often at the cost of bitter debates with old friends, such as Rudolf Carnap.