I have an old TR3 bonnet with original powder blue paint on it. (I've had it for 50 years so I know it's original). A few years ago I had the paint shop scan the under side, which we had buffed out, for a friend who was doing a powder blue car restoration. He decided not to use the code from the scan as he got some numbers from someone else but if it would help, I can have it scanned again. (Be interesting to see how close it comes to the TR4.)
Tom