I wonder if any of you kind folk can help me please. I want to buy a Group 1/2/3 car seat (universal ISOFIX), which according to the manufacturer will fit in my car. However I double checked in the handbook and it's completely contradictory. The first part says that universal ISOFIX will fit any car, but the second part suggests that only Group 1 will whereas Groups 2 & 3 require semi-universal. Am I seeing this right? It's one car seat, how can this be the case 
IL-SU = semi-universal
IUF = universal