Teaching staff at Lancashire school are set to go on strike over a decision that will see some students taught maths by a "virtual teacher" based 300 miles (about 480km) away in Devon.
The National Education Union (NEU) says members have voted to walk out on 3 and 10 December in a dispute over the virtual maths teacher at the Valley Leadership Academy in Bacup.
The school says the initiative is used for three top-set maths classes in years 9 to 11 and was "a targeted response to the national shortage of specialist maths teachers".
It said: "While we are disappointed that strike action is proceeding, we remain committed to working positively with our NEU colleagues to resolve this matter."
