The unmanned vehicle, which has been built by BAE Systems, is known as the Corax, or as the Raven.
The Corax bears some resemblance to a cancelled US military spy plane called DarkStar, analysts have said.
Jane's International Defence Review said the unmanned aircraft "indicated a new direction in combat vehicles for the UK's armed forces".
Bill Sweetman, the magazine's aerospace and technology editor, said Corax could represent one member of a family of stealthy aircraft based around a similar central body but using different outer wings optimised for different missions.
"If you look at that Corax shape, it's very reminiscent of something that's designed to fly fairly high, fairly slow and have quite a long endurance. It looks rather typical for a surveillance aircraft," he told the BBC News website.
"But if you take those long outer wings off and put on shorter swept wings, you have a somewhat faster aircraft that would be more of a penetrating strike platform."
The prototype Corax was first flown in 2004 after a 10-month development programme.
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