And to confuse things even further I misread above and thought you'd put the link to the LR site, when actually it was @jamesDiscoTD5 ! Anyway, got the answer I needed - thanks all.
Ride height sensors are RQH100030. Genuine are £110 each so I wouldn't bother. I've had a pair of the Britpart sensors for over nearly 4 years without issue. They're a 3rd of the price. The Britpart "OEM" ones are also available for a price...