Thanks for the explanation, this has given me a better understanding of how the performance differs to a standard set up, I think I still need a drive in a car with coilover to be truly convinced.
If it is indeed a night & day difference then these maybe worth a punt.
My simple mind struggles to comprehend a stiffer ride at the same time being more comfortable on less than snooker table roads, I refreshed my suspension a few years ago with Bilstein shocks and OEM springs (initially had Eibachs on, they soon came off) however the ride is hard to tolerate on...
First site I looked on, can’t comment on price.
https://www.demon-tweeks.com/uk/browse/products/shop-by/vaa__vehicles_code/59171be27f4a9?brand=Bilstein
I took my car here once when I first got it to have a couple of minor things done including rear brake pipes, I may have had a service can’t remember without looking.
Seemed pretty switched about BMWs.
https://maps.app.goo.gl/vYE6mNdh5YowejVC9?g_st=com.google.maps.preview.copy
I've had a DC47,46 and a DA36 on a bracelet, I regret selling the 36 though as I think it's a stunning watch.
The only brand that comes close for robustness are the tegimented Sinn's but I don't think they warrent the additional price.