ssc100 wrote:

I notice that your in Northamptonshire, can you tell me where I can get my RRS gearbox oil changed as I’m I northants as well ,thanks

Or use Bodsy who is mobile and will do it on your drive.
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RRSTDV8 wrote:

The oil will need changing if it hasn't already been done on a 2005 car, is the simple answer. LR say it's ok for 150k miles but the manufacturer reckons less than half that at 50-75k miles or 8 years whichever is sooner.

There are no specific symptoms that the oil needs changing but there are symptoms that it has corrupted the torque converter lock up clutch. The usual symptom is a juddering under load - the so-called cattle grid effect.

The best way to change the oil is a "mega flush" where the transmission's oil cooler pipes are re-routed to connect to a machine that replaces all of the oil. The usual LR method of draining the oil from the drain plug doesn't get much oil out as most is held in the torque converter.