We have the Graco Extend for this purpose and I think it’s good for the price. Apparently it’s only good for low centile babies though. If you ask on the Car Seat Safety UK Facebook page they can give a detailed recommendation.
Just bare in mind with the ones that spin, although they are convenient they don't last nearly as long as others due to the weight limit in them. X
My husband has the graco slimfit I think it is. It’s not on a base and he’s always taking it in & out so assume it’s pretty easy