MORE than seven in 10 teachers have said their school is “running on empty” ahead of an indicative strike ballot by Britain’s biggest education union.A survey of 2,000 National Education Union (NEU) members found 71 per cent believe their school does not have enough funding to meet basic provision for pupils.One teacher respondent said: “My school’s budget is so tight at the moment that we’re discussing no longer having whiteboards and pens due to the cost of replacing whiteboard pens.”