Here's a source I knew nothing about until Geoff Haynes drew it to my attention with this entry in the
Great Britain, Royal Aero Club Aviators’ Certificates, 1910-1950, now included in Ancestry. Roger Eastwood left Australia with 7 Inf Bn, but while in Egypt in 1915 received a commission in the British Army, and thereafter served with the 1st Essex Regiment. And evidently learnt to fly while he had the opportunity!
I have created a commemorative online database of the WW1 volunteers of Essendon and Flemington in Victoria, with a blog to support the website: see link below.
I have other websites and blogs which follow other interests.