I have 97,500 miles on my 2011 LR4 (5.0L V8) and hopefully don't have timing chain issues. Mine has never been done. I'm the second owner for the last 22,500 miles. The original owner had the oil changed yearly at the dealership with Castrol Edge 5W-20 for the first 75,000 miles and I've had the oil changed yearly since with Mobil 1 Extended Performance 5W20 every year (approx. 8,200 miles/year). I asked my dealership about the timing change because I had concerns, but he said the dealership (Bergstrom Land Rover) hasn't seen too many timing change issues - maybe 3 total since the LR4 came out (and one was from a guy who, literally never changed his oil and the timing chain failed at 60,000 miles - apparently, no joke, the guy thought his vehicle was listed as "maintenance free"). The service tech said as far as Land Rover issues go, that is lower on the list. There way more turbos that have to replaced on engines in LR vehicles like the Discovery Sport and Evoque he said.
My now ex-wife has the other 2011 LR4 we bought used 6.5years agowith 25k miles and she now has about 102,000 miles. That vehicle has had the oil changed yearly with the same Mobil 1 Extended Performance 5W20.
Fingers crossed.
BTW, the Mobil 1 Extended Performance 5W20 oil meets the required specification for oil listed in the owner's manual for the LR4. I can easily get this oil most places and can better top it off if I need to versus the Castrol from the dealership.