Possibly not after all - way back in history: The final cost of the first 310 Spitfires, after delays and increased programme costs, came to £1,870,242 or £1,533 more per aircraft than originally estimated. Production aircraft cost about £9,500. The most expensive components were the hand-fabricated and finished fuselage at approximately £2,500, then the Rolls-Royce Merlin engine at £2,000, followed by the wings at £1,800 a pair, guns and undercarriage, both at £800 each, and the propeller at £350.
£1500 more per aircraft was a whole lot in 1938.
Taranis is a good example - it is in many ways a full sized aircraft - just lacking a human capable cockpit. So BAE are quite capable.