HMS Renown flypast and RHA signalmen flying with the RAF

HMS Renown passing Ismailia on the Suez Canal c.1922 with a flypast of RAF Avro 504's, probably after collecting the Prince of Wales at Port Said. Image 2 - My Great Grandfather standing next to Avro 504k H6596 in Egypt, in 1922 I believe. This aircraft is possibly in another photo of his of a flypast over HMS Renown when the Prince of Wales boarded at Port Said in 1922 .

He was based in Egypt 1922-30 as a Signalman in the Royal Horse Artillery, I understand that in the early days of the RAF Signalmen from the RHA were used by the RAF on flights, though I cannot confirm that my Great Grandfather performed this duty. There are many aerial photos from this period in his archive indicating that he at least had a keen interest in Aerial photography. My Great Grandfather was R G Read and joined the RHA in 1914 aged 14, serving in the BEF later Palestine and Egypt until 1936, he re-enlisted in 1938 in the RA, but was captured at the fall of Singapore in 1942, where he spent the rest of the war as a POW, he survived and returned home to Aberystwyth but sadly died in 1946.