Found this a while back for the previous model: https://www.gap-diagnostic.com/faq-items/retrofitting-adaptive-cruise-control/ https://www.rangerovers.net/threads/adaptive-cruise-control-retrofit-how-to.340817/ Not found anything specific to the 5 yet, but can only be a matter of time before someone...

Had this issue on my Disco last month.. No leaks beneath, no obvious leaks in the bay..
So topped up and monitored every day for a couple of weeks.. No sign of levels dropping further..
Just about recovered from my minor heart attack

2017 3.0 TD6 HSE Luxury