sentences:  On his return to Britain his call-up for National Service was deferred to enable him to take employment with Elliott Brothers (London) Ltd at Borehamwood, Hertfordshire – on behalf of the Ministry of Aviation.He worked for two years at Elliott Brothers as research engineer in charge of the advanced circuits and logical techniques group in the Data Processing Laboratory.It was here that he started working with tunnel diodes, which showed great promise as a high-speed technology.