Molly, I'm no expert, but by breakfast I really mean something that means they are not going all morning hungry. Porridge or cereal and toast is better than nothing, and that, with a bit of fruit/glass of milk would be reasonably balanced and not expensive if bought in bulk.
I know children can be fussy eaters (my daughter was terrible) but I don't think it would do them any harm to have less choice, and eat it even if they didn't particularly want it, which they probably would if they couldn't bring in a lunchbox without prior consent. Vegetables and pulses are acceptable to most religions and sensibilities, and whilst there will always be someone who has intolerances and so on, with a 'take it or leave it' approach to lunch, the majority of children would be covered and policies could be drawn up to cover the rest, or the few relevant parents could send them with packed lunches as they will do now.
I really don't like the idea of Arts being only for those who can afford it. Music and drama (and poetry and things like scriptwriting) are very important, and if we want to watch/see/listen to Arts from a range of lifestyles we need to widen access to all of those things. I don't think that subsidising some families and not others is the answer though, as means-testing always misses out those who are deemed able to afford things, but who simply can't. They are often working families who then see those on benefits getting things that the (rightly or wrongly) feel are paid for with their taxes, and this causes resentments which are played on by governments.
Don't get me started on Dyslexia
. I know things will have moved on since my daughter's day, and I do understand that everyone wants special treatment which is impossible to provide, but IMO she was let down by the system, which just didn't recognise it at all in our LEA in those days.
When I was a child (mid 60s -mid 70s) there was a school dentist (peripatetic) who did quick check-ups once a year or so, and referred where necessary to the NHS dentists on every corner. We also had the nit nurse, and I think boys were checked for descended testicles (if the rumours were true). Basic health checks could be carried out at various developmental stages, so that things like malnutrition could be spotted early, and vaccinations offered to those who'd missed them. My children may have had BCG inoculations at school. don't remember any of that happening at their school (which may be because I've forgotten).
In short, much more could be done to ensure that children are as healthy and well-developed as possible. Playing fields are being sold for building land, and that should stop, too.