We are moving in the summer. The house we are moving to backs onto two schools, one non-faith, the other Catholic. The non-faith one is full and unlikely to have 2 places available by the end of the summer. The Catholic school currently has places available. We are agnostic/atheist. I have looked on the school website and it suggests that at yr3 they are expecting the children to be confirmed and whilst you can (in theory) remove your children from collective worship, it is intertwined in the school day and it would be difficult to remove children from it completely (the wording is quite discouraging).
If your child goes to a Catholic primary school, I would be very interested to hear how much religion there is in the school. I do not know much about the Catholic faith, but the little exposure I have had makes me think that it would be more full-on than a CofE school. I have yet to visit the school but it would be useful to know what I should be asking when I do (without sounding completely anti-religion).