Thanks for the long trail link.
I think I may be able to find out more about my grandfather Leonard Kirtland b. 1885
I know that he joined the ATC as a Driver landed in France in late December 1914.
I had a picture of him that I am trying to find out more about.
His older brother who was in another unit of the RVC is also in the picture (standing)
Judging by the relaxed atmosphere of the pic I think that it was taken near the base at Le Harvre.
The original is very degraded and has been enhanced. I am sure that there must be other clues to the time location.
I will post a temp link to see what others think
https://share.icloud.com/photos/0bcnNGJoMps2n-6cbkLfa11fAI thought that his unit entered France from Dover but Iam not absolutely certain of that.