The aircraft, which has cost £125 million to build, is intended to be the first of a new generation of aeroplanes that will reduce the need to risk human lives on long, dangerous missions.
It is to be flown for the first time in a series of tests over the Australian outback in the spring in an attempt to demonstrate the technology to military chiefs.
Nigel Whitehead, group managing director of programmes at BAE Systems, which has been developing Taranis, said the new drone could change the way aircraft are used by the MoD in the future, which currently uses manned planes for combat missions.
He said: “I think that the Taranis programme will be used to inform the UK MoD thinking, regarding the make up for the future force mix. I anticipate that the UK will chose to have a mix of manned and unmanned front-line aircraft”.