London & Provincial ceased flying in July 1919 after a dispute with Department of Civil Aviation (see United Kingdom Civil Aviation Authority), which refused them a licence.

Stag Lane became the main base of The de Havilland Aircraft Company Limited in 1920 and they purchased the freehold in 1922.

Stag Lane Aerodrome was sold for housing development in 1933, though a small 15-acre (61,000 m2) site was retained as a factory and offices for the de Havilland Engine Company Limited.

The last flight from the airfield was by a de Havilland DH.87 Hornet Moth, G -ACTA in July 1934, by which time the company factory had been relocated to Hatfield, Hertfordshire.

In 1976 the GPO (later British Telecom) opened the world's largest international exchange on the site, due to the hold ups in the construction of their new Mondial House, with the "De Havilland" Plessey TXK2 and "Mollison" Ericsson TXK5.