How do I paint the replacement wing mirror cover on my car?

My driver's wing mirror was hit and I ordered a new one. The cover comes primed and I bought the appropriate colour spray from Halfords. Is it okay to spray just using this as it already comes primed?...

What's the right colour to respray our 1972 Ford Cortina GT?

We need to respray our 1972 Ford Cortina 1.6 GT. It is a metallic green colour but we would like to know the exact name of the original colour. Can anyone help?

If I chose to deviate from the original colour with my Daimler Double-Six restoration, how much it would affect the value?

I'm looking into restoration with Jaguar specialists for my Daimler Double-Six Coupe. I wondered how much it would affect the value if I deviated from the original colour? The car is currently painted...