Sorry to dig up this again, but I was reading Page 208 of Fighter Boys by Patrick Bishop
And the passage reminded me on this thread
"Searching for his base in northern France after destroying a Me 110, Flight Lieutenant Ian Gleed of 87 Squadron saw a Hurricane flying serenely along and steered to join up with it. 'Just as I am drawing up to formate on this Hurricane, he dips I catch a fleeting glimpse of flying brick, and seemingly quite slowly, a Hurricane's tail, with the red, white and blue stripes, flies up past cockpit. I glance behind and see a cloud of dust slowly rising. He must have had some bullets in him to have hit that house. I wonder who was?'
The victim went to his end encased in a machine, sparing onlookers the horrible details. There was no body to confront. "
Now.. Trying to id this, incident.. then the 'evidence' as to this being Derek Hurlstone Allen #39840 (AFAIK) of 85 Squadron is that according to this web site
http://www.hatfield-herts.co.uk/aviation/gleed.html
On 17 May 1940 he arrived at 87 Squadron (which operated Hurricanes and had first deployed to France on 9 September 1939) as a replacement. He possibly became the RAF's fastest ace:
destroying two Bf110C's on 18 May, and two Do17z's and a Bf109E the next
day (he also shared in the destruction of a He111, and claimed another Bf109E as a probable).
So the incident of the Hurricane crash had to have happened after 17th May 1940 and the inference it being the 18th is the "after destroying a Me 110" the claimed two Bf110C (even though not 1) on 18 May.