Just had a quick check. As the rudder is turned slightly, it looks slightly different. But it is the correct shape for a Martin machine, whereas the Blenheim's rudder was more pointed, had a leading edge 'step', and wasn't as tall. Also, the Blenheim had a sliding panel on top of the cockpit, and was wider, whereas here the hatch is hinged to starboard.The turret on the Blenheim was taller, and with a single Vickers, later twin Vickers or .303 Brownings. The turret here is definitely a Martin, single glazed cupola, mounting twin Browning .50 cals. The fuselage is also slimmer, and the underside curve to the bomb bay can just be discerned. The deciding factor, Baltimore or Maryland, are the engine nacelles. The Blenheims ended half way across the wing chord, whereas these extend beyond the wing trailing edge ( the Maryland's end at the wing trailing edge.) Finally, the pic shows a much larger, and taller aircraft. Definitely a Baltimore, used only in the Middle East by the RAF, RAAF and SAAF, although I believe there were also some in Free French and Greek service in that theatre.