I have the avionaut pixel pro 2.0 c (use it with the seat belt). I absolutely love it and the midwives were impressed when we left the hospital. Join the group ‘Car Seat Advice UK’ on Facebook if you haven’t already, it’s really useful.
I have an Avionaut cosmo then when he’s reached the limit of that he’ll be in an Axkid Minikid 2 😄
If you're on Facebook there's a group called ERF for extended rear facing, theu have trained suppliers and offer advice, highly recommend xx