When I was putting together the last Caz Caswell Album and looking at the history of each aircraft, I was surprised that so many when originally restored had a high proportion of Original Components. But also came to the conclusion that over time a Spitfire is like an sophisticated version of 'Grandfathers Axe' My Dad replaced the Handle and I replaced the Blade, but it is still Grandfathers Axe.
The world can never have enough Restored Spitfires.