Original color

I agree with most comments. In the end, you don't want a drab or ugly color combo on the car just because that's the way the factory painted it.....you will pay hell trying to sell the car when the time comes. Choose a popular and sought-after color scheme such as opalescent blue w/ biscuit, or Opal gray w/ red, Navy blue w/ biscuit, or resale red of which there are too many already. But stay away from modern colors or metal-flake.

My 2 cents

Going back many years the purchase process for most fine cars offered a number of options, few cars were bought off the showroom floor, Many buyers ordered a vehicle before production started. They were then offered a standard range of options including colour, the more expensive makes also offer customisation and would outfit the car to the buyers specification! They could have any colour they wanted, Delivery time for the more complex requests could be lenthy up to six months. This is why there is a such a vast range of colour schemes at European car shows. If the quality is good the colour should be of no importance.

There have been some grippingly ugly colors in automotive history, and fashion comes and goes. That is some of the charm of a classic; a snapshot of taste (a Thunderbird in Coral? Chevy pickup in Turquoise?) Bear in mind that there were years that no Jaguar left the factory in British Racing Green. On the other hand, I've heard that there are more Jags on the road today in Carmine than ever left the factory that color. My car is no museum piece, but I managed to find a color I liked from the Jag palette the year it was manufactured. I'll post a pix someday.

I am not an expert on the subject so don't put too much faith in my words.

If the car is a 99.999 point concours restoration the original color is probably significant.

If the car is merely (grin) an "extra nice drive quality" example I don't think a color change would matter too much and might even help, if the original is one of the less popular choices.

A poorly executed color change would surely hurt the value and I'll assume you'd be staying with authentic Jaguar colors, yes? You wouldn't want paint and trim colors from a Mustang or Corvette.

Others would chime in.

Cheers
DD