Hi
Continuing from previous, Clockwise FE.2b fuselage fitment (18 Sqn. probably for Cavalry Contact Patrols as Cavalry Corps support squadron at time, however, it was brought down while engaged in night bombing so may have been used for the 'IFF' procedures in place at the time during 1916), DH4 fit behind pilot's cockpit used for gunner communication with pilot experiments during 1917, Underwing fitment on RE8 for Contact Patrols as were the four previous images posted. So anything similar on HPs would be of interest.
Mike
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