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 have looked for any surviving service records for ASC men that had a service number close to that of your grandfather and I found six records. From these records we know the following:
M2/019819 Arthur P Adamson -- enlisted 11/11/1914 -- embarked at Avonmouth, disembarked at Rouen
M2/019833 John Earnshaw -- enlisted 17/11/1914 -- embarked at Avonmouth
M2/019843 Thomas D Buckle -- enlisted 18/11/1914
M2/019882 Benjamin Robinson -- enlisted 17/11/1914
M2/019890 Sidney J Rosier -- enlisted 18/11/1914
M2/019895 Ellis Wood -- enlisted 18/11/1914
Your grandfather was given the number M2/019803 which, when compared to the above, would give his enlistment date of early November 1914.