The Villan asked:

"Does anybody know what the cost to the economy was for the Teachers strike?" No. Like the supposed average teacher's salary, there will be conflicting figures, as we are not talking about a straightforward calculation.

"Will they lose one days pay and the loss of one days holiday?" Yes, pay is deducted for striking. No, because a strike is not a holiday.

"Will they have money deducted from their salary to refund parents who have had to pay for extra childcare or even take a day off work to look after them?" Rhetorical question, so not worth answering. Who would administer this?!

"Will the bus companies that ferry the children to school be compensated for loss of income and if so who will pay for that?" Rhetorical question, so not worth answering, as above.

"Will the food companies that provide school dinners be compensated for loss of income and if so who will pay for that?" No. Like any strike, there is no compensation for those affected by knock-on effects. I think you know this already: another rhetorical question.