Ickle bubba isn’t a recommended seat unfortunately as they are mass produced and minimally tested. You could look at a joie stages seat or an extended rear facing seat would be your best bet as they have higher height and weight limits. Besafe stretch is 1 of the highest rated and is swedish plus tested but they are pricey. The axkid seats are also swedish plus tested and are more affordable. It might be worth joining a car seat safety group on facebook and getting advice from them
We have the Joie i-Spin and have been loving it. Great next step from the Joie pushchair car seat we have. This video was also golden for installing and sorting out the inserts too: https://youtu.be/Ozy2EZiQjdw?si=agmvSW3w8TvBNgv7 Also doesn't break the bank! Keep an eye out for offers and cashback.
Joie i-Spin 360 XL — we have two
Definitely the axkid movekid. My boy is on the higher centile and this will rear face him as long as possible. 36kg and it’s comfy and easy to install x
It’s also Swedish plus tested
Swedish plus tested and ERF Axkid, avionaut, BeSafe, Britax are good places to start
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I got this one recently as we had a similar issue and it's supposed to change with them until they don't need a carseat anymore! I'm happy with it so far :) Bonus, it has also gone down in price on this website... https://www.thenurserystore.com/p/ickle-bubba-rotator-360-spin-group-0123-car-seat-black-0-12-years?gad_source=1&gclid=CjwKCAjwnPS-BhBxEiwAZjMF0lrfJXGigSapcJhukfcD6zB-AhTMvz4bA9BKlTOdwFq3i1fHB-yMhRoCXDUQAvD_BwE I hope that's helpful! 🙌✨️