He was the recipient of the Military Cross for his service during the Second World War and was made a Commander of the Order of the British Empire for his work as an architect and designer.

[1][3] He was the first director of London's Rayon Centre, in an 18th-century town house close to Grosvenor Square, which opened in 1948.

[3] Lennon also gave a job to interior decorator David Mlinaric, early in his career.

[18] Lennon received the Military Cross in 1943 as an officer in the Royal Engineers[19] and was made a Commander of the Order of the British Empire (CBE) in the 1968 Birthday Honours.

[1][20] In the 1950, Lennon took over Hamper Mill, near Watford, restoring decaying buildings and turning them into homes.