I am also concerned that ISOFIX in the Golf is only on the outer seats, not the middle safest seat. Although, I have read that you can use the innermost ISOFIX points on either side to attach a middle car seat. Not sure if this is 100% possible, though. Either way, I'll be buying an ISOFIX Australian car seat (Britax Platinum SICT ISOFIX, for anyone that is also looking). I think you can use ISOFIX and/or standard tether and seat belt installs, so your warranty/legally isn't null and void. And, hopefully, best of both worlds.