OP, I can't figure out why you care. If you are not a parent at this school, and you don't work at this school, then it is highly probable that you do not know the full story. As for writing to the governers (or, as another poster has hinted, Ofsted), I strongly suspect that they have other things more pressing to deal with that where kids choose to eat their lunch (and believe me, some will choose to eat in the toilets, no matter what other provisions there are)
I teach in a relatively small state secondary. We have common rooms and a large-ish canteen, and students are allowed to eat their packed lunches in the canteens if they wish to, though not in common rooms (as these are also classrooms) Many choose not to - I am always surprised at how many students I see eating baguettes or sandwiches, bought from the canteen, in stairwells or sitting on the floor in the corridor. We have a lovely outdoor seating area, and some eat there (even in this weather)
We do have lockers, but not all students choose to use them. Many don't bother with coats, even in the cold weather we're currently having (not cool, apparently - a hoodie is apparently perfectly fine even in the snow)
We have staff who patrol with walkie talkies, and also CCTV. CCTV is useful if there is trouble at lunchtime, or if children claim that something has been stolen, or if toilets get vandalised or whatever. Walkie talkies are useful if there is a fight, and the member of staff on patrol needs to get assistance straight away. Teachers don't tend to carry their mobiles around with them. Walkie talkies are quicker. I don't see what the objection is - claiming that CCTV and walkie talkies make schools like prisons is just bizarre.