Hey Guys.
I parked up RR on a hill today and placed it into off road mode to access the area; however, the car now is having issues because it says air suspension inactive.

It holds air in a four bags however when one turns the key there is a hissing noise from the front left (Passenger). Once one turns off the ignition it goes away. This is strange, should it not continue to leak even when the key is turned.

Currently it holds all four perfectly. Just curious what my next step should be. Is there a leak? and if so what exact location of the line should I examine. Also does anybody know the route the air line takes to the bag for the front left so I can examine for any errors.

Maybe the slight leaks been there a while and the air sus inactive is to do with my parking?

That's almost the same issue I had with mine. Stopped on a slope to open a gate and when I came back to the car it was hissing air out of the front where it had jacked up to level itself (engine running).
It would be fine in standard height and wouldn't lose air at all.
If it's hissing, which is different to the normal 'pssst' of leveling, then there's a leak. You just need to try and get it hissing again (off road height) then get under with soapy water spray, that's how I found mine.