This is 399 Troop, 137 Light A.A. Battery at Hurst Park. Ranger Temple is 3rd from the left in the top row. Signed "Rob from Ranger" on the back in pencil as it was given to his cousin Robert Toomer Tucker.
Location Information
51° 24′ 32.41″ N, 0° 22′ 2.67″ W (to within 100 m)