I have been pointed in the direction of this French article on Taranis.
The general idea, is that BAE is unhappy with the work-share on FCAS and has more investment and a greater technological lead in Taranis. It also goes on to say that the next phase of Taranis testing will take place in Wales with specific facilities being created and the potential for future work being used as a sop for the Welsh assembly....
http://www.ttu.fr/fcas-retour-taranis/
Translation:
"Despite the agreement signed with Paris for the development of a common UCAV, London has in no way abandoned cooperation with Northrop under the UCAS-D program of the US Navy. But above all, Britain is pursuing with great discretion its work on its "black program" of national supersonic UCAV, the Taranis.
Directly inherited from the joint work with Lockheed in the late 1990s on the Dark Star, BAE has capitalized on this partnership by developing for its prototype its own stealth solutions. But most importantly, the British group has carried out important work on the integration of high-capacity batteries to enable the Taranis (the god of lightning among the Celts) to generate the electrical impulse necessary for the use of a future Weapon directed energy unusable on aircraft driven because of the deadly effects of its radiation.
BAE remains faithfully attached to this project because of the underweight that threatens it after the stop of the Eurofighter production line. But also because he considers himself disadvantaged compared to Dassault within the framework of the FCAS, as demonstrated by his campaign of lobbying the British parliamentarians. This campaign seems to have had a first effect.
Shortly before the Paris Air Show, it was decided to integrate the Llanbedr air base, also located in Wales, to the Aberporth test center, now operated by QinetiQ, and used until 2001 by the DTOE and The DERA for weapon system testing. While Aberporth is hosting drone trials, such as the Watchkeeper, the most secret projects, such as the Taranis, HERTI or Mantis, were tested in flight far from any potential listening area on the RAAF prohibited area In Woomera, in the Australian desert, located 450 km from Adelaide. The MoD has recently decided to launch new test campaigns on the Taranis, no longer in Australia this time but in Llanbedr.
The awakening of the Taranis would have been presented to the Welsh parliamentarians as a lever for economic development. A decision which, if confirmed, may give rise to financial arbitrage in the face of the FCAS, due to the state of British military budgets."
It might explain my observation that BAE has so little to say on the subject of FCAS....