  We study the emission of soft photons coupling to high energy fixed angle
scattering processes at first order in the electromagnetic coupling but to all
loop orders in a class of theories without soft divergences, including massive
and massless Yukawa and scalar theories. We adapt a method introduced by del
Duca for quantum electrodynamics to show that subleading corrections to the
soft photon theorem are sensitive to the structure of non leading external jets
of collinear lines. Our techniques are based on a power counting analysis of
loop integrals and an application of jet Ward identities. We also apply Grammer
and Yennie's decomposition to isolate separately gauge invariant contributions
to the soft photon expansion. These are interpreted as infrared sensitive
matrix elements coupling to a field strength tensor.
