Maxi-Cosi Rodi XR Group 2 and 3 Forward Facing Car Seat (Tango Red) £63.91 delivered @ Amazon
I know you can get other seats cheaper-but this is a great price for a seat with great reviews.
£85 at Halfords
* Maxi-Cosi Rodi XR Car Seat has a comfortable extra reclined position
* Unique relaxed reclining position for both small and larger children
* Backrest grows along with your child in both length and width
* Optimal side crash protection for head, lower back and hips
* Anchorage point in headrest stops the seat moving when not in use by the child