The HAC was based in London and would have no link with Heckmondwike. The uniforms look like earlier period than WW1, possibly 1908 when the Territorial Force was formed, replacing the old Volunteer movement.
The Heckmondwike artillery unit was the 6th West Riding Battery, part of the 2nd West Riding Brigade, which in 1914 became part of 49th Division, TF. Their headquarters were in, surprise!, Artillery Street.
An expert may be able to identify the artillery pieces and date the photo more accurately.
A