Teachers marched through central London on Thursday of last week in protest at cuts to education funding.
The NUT union called the protest.
Tory changes to school funding will snatch the most money from the poorest children, according to research by the NUT and ATL unions.
Primary schools with the most deprived children would lose £579 per pupil in real terms. The figure for secondary schools is £784.
“It will mean cuts to staffing, which will mean children having bigger class sizes,” explained Kingston teacher Khawer Siddiqi.
“It will mean a reduction in the number of courses offered. And there will be more unqualified teachers in the classrooms,” he said.
Sarah, another teacher, added, “It will affect children with special educational needs who need more support.
“In my school children speak lots of languages and we have refugees. But there’s not enough money to support them.”