TBH, I'm not sure we would spend much more if we HE'd. We get free school meals, so obviously there is an extra 5yo sized lunch a day, which will of course grow as she does and as we would have started getting free lunch for DD2, but we would have to have bus passes anyway just to get about before and after school. I have a terrible addiction to buying books and educational toys online anyway (a lot of which is aimed at HE families)
We would have more time to go into on of the city libraries, rather than the local one (we are members of four different library authorities anyway, because of where we live) both DDs have too many clothes anyway, from ebay, hand me downs etc so the main expense for DD1 is things like school tights and pinafores because she will not stop growing 
We already pay for Rainbows and nursery, and we are looking at music lessons for DD in the next couple of years as well as dancing for both of them when DD2 gets to 2 and a half. Plus of course the endless school and nursery appeals for everything.
And we are limited by school hours and term times now for everything - working is made harder for me because I am only free 10-2 and we can't go and see family etc as much as we used to. Before they did mass education we kind of worked around each other and I did a lot of teleworking while we stayed with my parents or they could stay over at the ILs house. I could also take the kids across and help care for my Grandparents. Now our entire family is focused around school.
Everyone has to be up, breakfasted, dressed, hair done, by 8.30am, so no more evening nature walks, staying up to watch tv or play a game, no more watching the news and having a chat or pyjama days. The DDs have their hair tied back nearly all the time now - they can't have wild days or do their own hair with 50 sparkly clips apart from on the allotted free days, most of which are spent dashing around trying to do all the stuff that used to be done in the week when there weren't so many people in the way.
We spend half our time running about finding school uniform, school shoes, the nursery lunch bag, reading books, homework, notes to school, notes from school, etc.
Still, we made the choice that we wanted to use school/had to due to circumstances, and all that stuff comes with it. We feel that it is worth it, but not everyone would. It is much more complex and expensive though, and definitely a deliberate lifestyle choice.