Kerby was awarded the Air Force Cross in the New Years Honours of 1 January 1919.
He was again appointed an acting major on 1 May, and on 1 August was granted a permanent commission in the RAF with the rank of captain (flight lieutenant).
He served on the staff of the No.
1 School of Technical Training at RAF Halton from December 1919, until sent to the RAF Staff College at Andover on 3 April 1922.

He was one of the first students at the Staff College, which had only just opened under the command of Air Commodore Robert Brooke-Popham.
The Directing Staff included Air Commodore Robert Clark-Hall, Group Captain Philip Joubert de la Ferté, Wing Commanders Wilfrid Freeman and Charles Edmonds, and Squadron Leader Bertine Sutton, while Kerby's fellow students included Wing Commanders Jack Baldwin and Richard Peirse, Squadron Leaders Conway Pulford, Keith Park, Wilfred McClaughry and Charles Portal, and Flight Lieutenants Eric Betts and John Cole-Hamilton.

On completion of the Staff College course he was posted to the Air Staff of No.
3 Group on 4 April 1923, then to the staff of No.
3 Wing, India, on 14 September.
Kerby was promoted to squadron leader on 10 October 1928, before finally returning to England to be posted to the RAF Depot at Uxbridge on 6 April 1929.
On 1 November he was posted to serve on the staff of the Directorate of Operations and Intelligence in the Air Ministry, before finally returning to flying on 4 April 1934 as Officer Commanding No.
504 (County of Nottingham) Squadron, a Special Reserve Squadron of the Auxiliary Air Force operating Westland Wallace bombers from RAF Hucknall.
He was promoted to wing commander on 1 July 1935, leaving No.
504 Squadron on 5 August.
From 5 October he was a supernumerary officer on the staff of RAF Far East, and from 16 November 1936 served as Air Attaché at the British Embassy in Beijing and Shanghai.
On 1 January 1939 Kerby was promoted to group captain, returning to the No.
1 RAF Depot on the 26th.
Kerby was awarded the Air Force Cross in the New Years Honours of 1 January 1919. He was again appointed an acting major on 1 May, and on 1 August was granted a permanent commission in the RAF with the rank of captain (flight lieutenant). He served on the staff of the No. 1 School of Technical Training at RAF Halton from December 1919, until sent to the RAF Staff College at Andover on 3 April 1922.
He was one of the first students at the Staff College, which had only just opened under the command of Air Commodore Robert Brooke-Popham. The Directing Staff included Air Commodore Robert Clark-Hall, Group Captain Philip Joubert de la Ferté, Wing Commanders Wilfrid Freeman and Charles Edmonds, and Squadron Leader Bertine Sutton, while Kerby's fellow students included Wing Commanders Jack Baldwin and Richard Peirse, Squadron Leaders Conway Pulford, Keith Park, Wilfred McClaughry and Charles Portal, and Flight Lieutenants Eric Betts and John Cole-Hamilton.
On completion of the Staff College course he was posted to the Air Staff of No. 3 Group on 4 April 1923, then to the staff of No. 3 Wing, India, on 14 September. Kerby was promoted to squadron leader on 10 October 1928, before finally returning to England to be posted to the RAF Depot at Uxbridge on 6 April 1929. On 1 November he was posted to serve on the staff of the Directorate of Operations and Intelligence in the Air Ministry, before finally returning to flying on 4 April 1934 as Officer Commanding No. 504 (County of Nottingham) Squadron, a Special Reserve Squadron of the Auxiliary Air Force operating Westland Wallace bombers from RAF Hucknall. He was promoted to wing commander on 1 July 1935, leaving No. 504 Squadron on 5 August. From 5 October he was a supernumerary officer on the staff of RAF Far East, and from 16 November 1936 served as Air Attaché at the British Embassy in Beijing and Shanghai. On 1 January 1939 Kerby was promoted to group captain, returning to the No. 1 RAF Depot on the 26th.
Harold Spencer Kerby