Within a few years, multi-channel transmission (1932), microwave transmission (1934), coaxial cabling (1936), the entire radio systems for the liners Queen Mary and Queen Elizabeth (1936–39), the patenting of pulse code modulation (1938) all contributed to the hey-day of telephony’s development.
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At that point in history, British Telecom was a state monopoly, and even by 1982 BT only allowed (via approval) the four British manufacturers (STC, GEC, Plessey, and Thorn-Ericsson) to supply its twenty five types of phone through them, and not independently.