From the link in post 5:
0736. Physical Training Instructors badge.
The badge, worn by qualified physical training instructors below the rank of WO, depicts
crossed swords with an eagle superimposed, surmounted by a crown. It is to be worn on the right jacket sleeve of No 1 SD (male and female
personnel) and No 6 SD with the top edge of the background ½" (1.3 cm) below the point of the chevron. A white background version is
provided for the PTI Jacket and vest.
I'm not too sure that WO Isherwood should be wearing the PTI badge on his No.1s.
