New to a RRS (although joined here many years ago and have owned various Disco 3 / Disco 4 / Disco Sport between my wife and I)

I suspect there is a post on this somewhere, but I have searched and failed to find it.

My wife now has a 66 plate RRS with deployable towbar. But it doesn't have the buttons in the boot to adjust the suspension height. She tows 2 or 3 times most weeks and has previously used the buttons in the Discos to make hitching up easier. So, ideally, I'd like to add the boot switch.

I can see that the switch module can be bought fairly readily. Is it 'plug-and-play' or is there more to it?

Many thanks 66 RRS 4.4

Has nobody done this? Surely someone must have? Or do I just need to give it a go and see what happens?! 66 RRS 4.4

I thought all RRSs had the suspension buttons - but I'd only at looked at post facelift models.
Having looked at a few pre-facelift ones on autotrader, including autobiography's - there is no switch pack in the boot. So I suspect it wasn't a thing on the pre-facelift models and consequently there's no coding for them.