500N
The answer is on the website:
I received an invitation to lunch with Alex Henshaw at his home and we ended up spending the day together, we were both like kids talking all things Spitfire, it was interesting in that a lot of the same problems Alex and his team had.We have encountered the same problems in production but as Alex said if it was easy every one would be doing it. A truly amazing man, who has followed us with pride and said we have now made the Spitfire immortal and the memory will never fade. He said it was a pleasure to see them in production again. he could fully understand why we only produced 90% scale aircraft in today's world. Engine reliablity and horsepower was the main factor, with purchase cost and hangar space also being an issue. Alex made the comment that for all the problems in manufacturing the Spitfire it has never been surpassed in pure flying for the joy of the pilot . He also made the comment that he had flown many other types of aircraft but nothing comes close to a spitfire to be at one pilot and machine.