The 3-view is not correspond to real aircraft, it's just on of the preliminary drawings. Real prototype N.169 had straight wings and monoplane stabilizer.

The Viking Mark VII ("Type 83" in Vickers numbering) was a development of the Vulture, a three-seat open-cockpit fleet spotter to Air Ministry specification 46/22 given the service name Vanellus when taken on for evaluation by the RAF against the Supermarine Seagull design.