Are there any laws regarding the size a classroom must be?

[Eachpeachpearwherestheplum]

30 children, especially in kS2 when they are so much bigger! My sons 1 form village school has always had around 17ish pupils per year group. As it has grown in popularity, classes in Reception and Year 1 are now 30. The classrooms are tiny and the head says there is no funding for building work. I was wondering how on earth 30 were going to fit and if any laws applied here!?
I found this www.hse.gov.uk/contact/faqs/roomspace.htm but I dont think classrooms count?!

There are guidelines but no laws. The current method for assessing the net capacity of a primary school says that you need 49m2 in the classroom plus a further 14m2 of ancillary space for 30 children, i.e. 63m2 in total. The ancillary space cannot be the school hall. It must be predominantly teaching space - either part of the classroom or a shared teaching area.

Having said that, many older schools do not comply with this guideline.