The government has enforced a limit of 30 pupils to one teacher in infant classes
But there is no cap for older children
Unions advocate for the 30:1 ratio to be extended to all classes regardless of pupils' age
"Teachers in class sizes that are manageable are able to pick up some of the smaller issues that are difficult to highlight in a child," she says
Miss Williams says class size does little to affect the teachers' workload
Dr Stephen Curran, a teacher for 35 years and a government adviser, argues that bigger classes can be "extremely good" in schools where resources are used "wisely and effectively"