When I went to pre school (1996ish) my mum actually sent someone in with me every day... however, when I went to primary school the teachers were amazing. I knew who to speak to if I felt hypo, and they always made sure they knew how to test my blood sugar and what behaviour may be out of the ordinary. The dinner ladies always kept aside a cookie (which I had for pudding every day to make sure the carbs were enough) and the teachers wrote a note every day of something different had happened. One teacher actually had to treat a massive hypo, and by the time my mum arrived I was fine! my school was amazing with my diabetes, however I can't speak for other schools, and it's a shame about your experience getting more hours.