Charles Challoner, ED559's bomb aimer, has unfortunately, not been easy to trace. However, I came across a match for a Pilot Officer CS Challoner on a memorial to members of the Manchester Police who died whilst on active service in the Second World War. I am assuming this is the same person as on ED559. Hopefully, this will provide an additional avenue for research.

UPDATE: I emailed the Greater Manchester Police Museum regarding Challoner and received some limited information confirming he was indeed a policeman before resigning to join the RAF. 

He joined the police on 18 April 1934 aged 19 and it shows he was from Shrewsbury and was a Salesman. He married on the 21 April 1937. He resigned from the police service on 5 October, 1941 to join the RAF and his record card notes he was Killed in Action on 4 March 1943.

I emailed the local historical society in Singleton, New South Wales asking if they had any information on Errol Crapp, ED559's navigator. Unfortunately, they informed my that Errol's father, the Rev. Arthur Frank Crapp, had only moved to the town in 1941 when he became a local Methodist minister. Due to this they surmised there would be relatively little about Errol in their records. They did send a small piece dated 10 January, 1944, from the local newspaper, the Argus, confirming that Errol Crapp was now presumed dead. The information from the same source did mention that Errol has two brothers in service, Bombardier Garth Crapp of the 7th Div (elder brother) and Gunner Alan G. Crapp (younger brother). The snippet also confirmed Errol Crapp's birthday as 17 February, 1919 in Grenfell, NSW. 

I made contact with 100 Squadron Association's historian, Greg Harrison, over the bank holiday weekend. He supplied the movement card for ED559, something I had not seen. Greg has also be kind enough to answer my myriad questions about ED559, 100 Squadron, Lancasters and the RAF. 

One gem Greg sent me was a picture of Richard Curle during training at his OTU.