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I have a yellow LC and it has faded, a good polish with Autoglym super resin polish will make it look a bit better but you will have to do it on a regular basis
No it won't if you try to hard to restore the colour you rub the paint off all the ovni yellows are the same even the ibiza's, you need a full respray end of.
Use Autoglym Super Resin Polish on good condition brightwork and other metallic surfaces, i.e., wheels, instead of using a metal polish which may be unnecessarily abrasive.
Remember, the topmost layer of your paintwork is the strongest and should be preserved as far as possible. It is better to polish 2-3 times using Autoglym Super Resin Polish to restore the finish than to use an unnecessarily abrasive paint restorer.
I didn't say anything about restoring the colour, yes a full respray is the only way to 100% solve the fade but a good polish will help protect the paint and give a more even shine
Maybe you should read up little more on the Autoglym range