My LR4 is exactly a year old. Never polished or waxed. Just the way it came from the factory. Do I go in for a polish and wax or should I only do they wax?
Clay is definitely a good suggestion.
A polish may or may not be necessary, but if you clay your vehicle it will be. The way a polish works is by removing small minute scratches known as "spider webbing". The sharp edges of the webbing is what causes that circular "shine" when the sun hits your paint. By removing them you can bring back a glass like finish. Remember that clay bars can cause scratches (minor) and they're supposed to. A polish will easily remove those.
IF (and that's a big IF) you polish a vehicle properly, you don't need wax to see the "shine". Wax just protects. With that being said, when you take a vehicle to a car wash or detail shop they give you your vehicle back after it has been waxed. The wax does have fillers in it and can hide a poor wax job. What does this mean to you? Basically that you have to go back more often because a crappy polish job will keep showing up. A mobile detailer (a respectable one) will usually do a much better job, especially if you develop a good relationship.
SO!... After a year, you definitely want to clay that bad boy, polish it up good, and if you usually go a year between this type of care use a SEALANT instead of a wax. The polymers in the sealant are bonded together differently than those in a wax and protect for 6 months to a year, where as a premium wax really only lasts 3 months depending on how you store the vehicle and how much you drive.