My son went to a very middle class school and was one of 6 coeliacs out of 600 people, he changed to a school in a very deprived area with > 800 pupils, he was the first coeliac they had had.
My DD has been the only coeliac in her school of over 600 in her whole 7 years there. But my neice and nephew have several coeliacs in their tiny village primary school of less than 100. Nationally the rates are 1 in 100 but as the symptoms can be mild and vary a lot and access to diagnosis is long and tedious and you generally have to push your GP to test I would suggest that most of those diagnosed will be from a higher socio-economic group who are more confident to challenge GPs and motivated to educate themselves.
Having a coeliac child is a massive challenge. If you don't have much money or time and the outward symptoms are often mild pressing your GP for months to address it can seem like an upward struggle that you can do without then to recognise that you can never trust anyone (even school/childcare) to feed your child again without being "that" parent. It's hard.
Tbh I've veered from the point of this thread as @Porcupineintherough is right prescriptions won't help these children that aren't getting diagnosed or whose parents don't manage their child's diet properly. And this doesn't help the pregnant OP who just wants some toast! But maybe some way of supplying bread and flour alongside education and support for families might help these children? Wouldnt that be the responsibility of the NHS? I'm constantly shocked at how badly informed everyone seems to be about coeliac disease including teachers and health professionals.
I think if you tell the school/others that your child has a nut allergy that is all you need to say and nuts are banned from lunchboxes etc. Fair enough. Whereas my DD has to be surrounded by crumbs every lunchtime, kids throwing food, being asked to cook with gluten in DT lessons, gluten treats being handed out at the end of the school day, all due to ignorance and lack of care. The teachers apologise when it's brought up but they clearly don't give a fuck because it keeps happening. Luckily my DD will raise issues and educate her friends and teachers because she's a confident little thing. I don't imagine many of you would want your kid in this position though?