Oh the food thing....I would be very careful....
My DDs had breakfast at 8.30, milk (and the free fruit too up to P3) at 10.30 and then school lunch at 12 (12.30 when older)
IMO they did not NEED a 'playpiece' -a snack at 10.30. I would occasionally send something in as a treat...
They are not under or over weight, they weren't hungry. I think lots of problems with obesity are caused by our need not to let our DCs go for more than an hour without putting something in their mouth.
DD1 would never refuse a treat - the kind of child that eats all their easter eggs in one sitting, was verging on being slightly overweight at one stage - DD2 very different, will only eat when she is hungry...has brought her playpiece home as she didn't want it that day.
DD1's friend always had sweets/crisp (never heard of anyone having a healthy playpiece -always crisp/sweets) and they would share with DD (I wasn't pleased but nothing much I could do -actually though it was probably doing the other child a favour!)
Then friend's mum started sending something in for DD1 too... I was furious. I did attempt to speak to the mum about it and she thought I was thanking her and she was doing me a favour -so without creating bad feeling there was nothing I could do but live with it and reduce treats at other times...thankfully that child left a year or so later.
They also didn't get snacks as soon as they finished school (unless they were hungry). DD2 has an activity straight after school and some of her friends always have a snack as they are walking along. Years ago I asked DD2 if she was hungry and would like something too and she said she was fine. I wondered if she was just saying what she thought I wanted to hear...
They have offered her a biscuit, crisp etc and she does usually take one. Anyway the other day I was going to be a bit late so asked another parent if she would walk DD2 along too... Parent must have brought along an extra snack for DD2 (as I would have done in similar circumstances) - as I was catching up, still quite a way behind I saw DD refuse it (a bag of minicheddars which I know she likes) and so I think she really is fine...