You might find my new website of interest:
http://www.ddayancestors.com/
This is compiled from a 'Normandy Roll of Honour' I compiled some time ago. Details of your man from it:
Harman, H. L/Cpl 4342693
Killed 11th June 1944, age 30.
Buried - Hottot War Cemetery.
I also have war diaries for all the D Day units, and will check to see what I have on them, but they would have come in via Gold Beach on D Day.