I got the Joie baby stages car seat, really easy to install with a seat belt and lasts until 4 I think.
We recently bought a new car seat for my daughter; she started out in the cybex one! We opted for the JOIE 360 one which goes from birth to 12 years old (although I definitely wouldn’t put a newborn in there). & the isofix is actually attached to the car seat so it’s easy if you need to move from one car to another.
Car Seat Safety UK on Facebook is great! Admins on there can let you know the best car seats out there 👍🏻 We’ve got the Be Safe Stretch for my little man. He is so comfortable in it compared to to his infant seat. X
We have just got the britax max safe pro which is really good rear faces for many years I’m impressed with it. It’s tethered not isofix x