Garry's interest is particularly focused on those aspects which have tended to receive less attention in the vast Battle of Britain historiography, which began to develop in late-1940, and now runs to many hundreds of books. These include the:
- importance of Operation Sea Lion, Hitler's threatened invasion of Britain, to the Battle's settled narrative
- propaganda war fought on both sides of the English Channel
- relationship between intelligence and propaganda
- intelligence war itself, focused principally on aircraft claims
- impact of propaganda on morale, both military and civilian
- British Air Ministry's March 1941 success in so quickly elevating the Battle to near-legendary status
- post-war valorisation of the Battle
- eclipsing of RAF Bomber and Coastal Command from the story of the Battle, which even by early-1941 was credited to the Few alone
- cultural history of the Battle
- context of the Battle and Blitz within 1940 as a whole
- importance of the Battle to Winston Churchill's position as Prime Minister, especially during 1940 and 1941
- Battle's heritage, and conservation of airfields and other sites
Published and forthcoming book reviews:
- Forthcoming. LaSaine’s Air Officer Commanding (Dowding), War in History.
- Forthcoming. Braganca & Tame’s (Eds) The Long Aftermath, War in History.
- 2018. Bergstrom’s Battle of Britain and Kelly’s Never Surrender, War in History.
- 2017. Ferris & Mawdsley’s (Eds) Cambridge History of the SWW, War in History.
- 2015. Holman’s The Next War in the Air, War in History.
- 2012. Black’s The Face of Courage, War in History.
- 2012. Sarker’s How the Spitfire Won the Battle of Britain, War in History.
- 2011. Cumming’s Royal Navy and the Battle of Britain, War in History.
- 2010. Dixon's Churchill and Dowding, Journal of Strategic Studies.
- 2010. Francis's The Flyer, War in History.
- 2009. Orange's Dowding of Fighter Command, War in History.
- 2001. de la Bédoyère's Aviation Archaeology. Ind. Arch. Review. XXXIII, No 2.