The photo would most probably have been taken before the Labour Corps, who had their own badge, was formed. Home Service (Employment) Companies were formed in July/August 1917. 566 Coy was employed in the Blackpool area. These companies were formed from the least fit men who were already being employed on garrison type duties at home and provided batmen. cooks, storemen and the like. His number, if you have it, will give an indication as to when he was transferred to the Labour Corps, and may turn up a pension claim.
MaxD
Source - No Labour No Battle by Lee and Starling
Deletion - see later post