Which 9 month - 4 years isofix car seat has a toddler proof buckle and very tight straps?

[MuffinMclay]

Following on from my thread here about ds1's antics, is there a really toddler proof car seat out there? Have Britax Duoplus Isofix at the moment. Need something that not even Houdini himself would be able to get out of.

We have the same seat, and as long as I do it up tightly I cannot see any way that dd could get her arms out of it.

Thankfully she's never tried to undo the buckle. Not sure how you would get round that one.

we have the bebeconfort iseos and ds1 can't undo the buckle on it.