Well done it is the V-141.
LINK-- https://en.wikipedia.org/wiki/Vought_V-141
And the prize.

This weeks headache??

Have fun

I think I found it, kind of cheating though...
I wont reveal it yet...

Obviously, British...
First flight on 23rd of May 1944, isn't it?

Correct you are

Last clue
Polish aerobatic and display pilot Squadron Leader Jan Zurakowski put the plane through its paces before an enthralled audience. Zurakowski, as quoted in a Rolls-Royce publication, said the xxxxxxxx was ?the best airplane I have ever flown.?

Gloster Meteor?

Wingco

Good call but no.

The answer that Elephant obviously new was the Martin Baker MB5.
LINK - http://www.axis-and-allies-paintworks.com/e107_plugins/forum/forum_viewtopic.php?12519

And the prize

This weeks headache.

Have fun

Is the photo tilted somehow? (rotated?)