I am grateful to hw97karbine for supplying the link below of rare footage involving my Great Uncle. Two years later he was killed in action. He is well remembered on this site.
Update – I am grateful to a cousin in Canada for adding this detail in the comments below:
“The book RAF Southend 1940-1944 by Peter C. Brown outlines in it the station log for that day as: “19 August 1942 as ….Operation Jubilee: an amphibious assault by Canadian, British and US troops was mounted to seize temporarily the Channel port of Dieppe.” And later on in the entry: ” When the turn was made over Dieppe … two Do 217s were then sighted over the rear of the main concentration of Allied shipping, bombs being dropped but well wide of their targets. Blue 1 fired at one of the Dorniers as it was entering cloud from a range of 600-700 yards but no results were observed.”
The Somme 
Thank you for the footage; the book RAF Southend 1940-1944 by Peter C. Brown outlines in it the station log for that day as: “19 August 1942 as ….Operation Jubilee: an amphibious assault by Canadian, British and US troops was mounted to seize temporarily the Channel port of Dieppe.” And later on in the entry: ” When the turn was made over Dieppe … two Do 217s were then sighted over the rear of the main concentration of Allied shipping, bombs being dropped but well wide of their targets. Blue 1 fired at one of the Dorniers as it was entering cloud from a range of 600-700 yards but no results were observed.” The log entry is quite extensive. Are you familiar with it?
Thanks, interesting, and no, I am not familiar with it, so thank you. I am reasonably familiar with the attack on Dieppe, so I will revisit that with some reading.