I've got the White Lux pram & wondering what adapters I can buy to fit a carseat as I don't have the original car seat?
The original car seat is, honestly, really not good and not very safe. In your case, I would definitely suggest a safer car seat to protect the baby anyway, so no worries about not having the original one. The thing is, as a very cheap pram, the Babylux/Raf-Pol Polish brand doesn't really offer the adaptors just so, they're usually available on-demand while buying the stroller system. So I would contact the seller you bought it at and asked I Maxi-Cosi-style adapters can be ordered for your pram.
Also, you can get a pre-owned part, just the adapters, or the whole pram in classifieds (like [[https://www.ebay.co.uk/itm/334033863976?hash=item4dc5f84528:g:YAgAAOSwTzxgazkh|this ad selling the whole set for under 30 pounds). This is, as I already said, not the best option but at least some, anyhow.