Just to say I pulled my boy out of state primary in yr 1 and we have been amazed at what is of offer my husband was against it but he has said "that was the best thing we did"
It is a heavy bill why??? I was calculating a lot more than my Dad paid when I was sent to private school. Don't listen to people who criticise you (I heard years later people criticised my Dad for doing it) for coming out of the state sector it is your child/ren and you only have one chance.
I do think it is especially relevant if you work more than 3 days and can't do many pick ups as private school can do what you haven't got time to do. We used to take him to football on Sat am to "top up the low amount of sport he had" now we don't have to. I know he get's read to everyday so I can relax on the days my nanny picks him up as she can't really do reading and homework with him to the standard I do it to.
What I would say is look at EVERY school and register ( I know it is galling they charge for this but you just have to accept that)
You never know which one you might use don't get set on one particular one. I had a spread sheet

and kept changing the rankings depending on what I heard, if you have time skulk around at pick ups/ drop offs then you really see what the school is like take the "open days" and some ofstead reports with a pinch of salt but you need to go/look.
Good luck