Thanks for the responses. As some have guessed, it’s a legality issue - you must have diamond pattern chains that fit in order to visit some ski resorts here, even if you have snow tyres fitted. Spider chains are also banned at some resorts, so the chains must wrap around the inside of the tyre. I have never had to fit snow chains to an AWD, but don’t want to get fined for carrying chains that can’t be fitted. Wheel spacers would work but are illegal here (or, at least, that’s my understanding). So I was just checking what others might have done and thought that maybe if the strut wasn’t exactly perpendicular to the ground, increased spring height might change the geometry enough to provide a bit more inside clearance. I only need 10mm extra. I also have a MY2019 DS and it has much more clearance - there was obviously a design change for the MY2020.
It will be interesting to see if all the advice on this thread on springs and tyres sizes continues to apply for MY2020 and beyond. I only have about 10-15mm gap between the tyre side wall and the strut. That’s on 235/50 R20s. It’s even worse on 235/60 R18s because the increase wall height causes the tyre to bugles out slightly (probably tyre specific). I suspect any tyre wider than 235 will be a problem without changing the rim offset. 255 tyres from LR come with 9” rims, so the offset is different.
Snow tyres are an option (even with snow chains), but I drive 350km every weekend in winter, only the final 5km of which might be on snow. Even then, most times the road has been cleared or the snow is so pathetic it has melted. And snow tyres are expensive here. So I’ll probably go with a set of mild all terrain on the second set of rims with less positive offset.
What I thought would be a simple purchase of a set of chains has become very expensive, particularly now that I’ve read and seen pictures of what others have been doing! I smashed up the plastic bash plate on the weekend. Rival bash plate is in the mail, so maybe I’ll go all in with 18” rims, springs and ATs!