Percival Q.6 Petrel.
Britsh Government
<p>Photo found on: <a rel="nofollow" class="external autonumber" href="http://www.pilotfriend.com/aircraft%20performance/Percival/6.htm">[1]</a> <br></p>
Original uploader was <a href="https://en.wikipedia.org/wiki/User:Bzuk" class="extiw" title="en:User:Bzuk">Bzuk</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a> 8 April 2007 (original upload date)