DH has got in touch to let me know he's not put any ice packs in either DC(6) or DC(1)'s lunch bags this morning when he got them out of the fridge. Both bags are insulated and food was kept in the fridge, DC(6) had a big box that was in the fridge all night with ham sandwich but DC(1) only had small little pots in the fridge but had one vegetable that can go funny when warm and food didn't really take up much space in the bag, would they last 3.5-4 hours in this weather? It'll be 22/23 degrees here by their lunch time.
I don't remember ever having an ice pack in the 90s, had warm sandwiches regularly and was fine but obviously don't want to risk our own kids getting food poisoning.