I have a “Britix ispin safe” available. It’s isize and sweedish plus tested and it spins so really handy for getting small humans in and out (particularly if your back is a problem). Approx age birth - 4 years. It’s a rear-facing seat and gets amazing ratings for safety (Sweedish plus, ADAC). Isofix base included. Seat always stayed in one car. No accidents. No drops. Never stored. Probably minded more than the kid who sat in it (I’m a car seat nut). Manufactured in 2020. Available new for €389-445 depending on retailer). Selling for €140 o.n.o.