The unions want the benchmark for calculating teachers' salaries to be the current minimum wage; at present, salaries are linked to the minimum wage in 2014.

They are also calling for an increase in the wages of people working in education who aren't teachers.

The unions want the number of hours of classroom instruction to be capped at 22 a week, and they want teaching assistants' hours reduced from a weekly 40 to 35. The demands have been sent in a letter to Prime Minister Viktor Orbán.