I think the title should be 'economically motivated...'
My understanding is that, before the government review reports, teachers are being asked to increase their employee pension contributions to 10% of earning - which is higher than the rate of most private sector or stakeholder pensions.

Public sector pensions almost certainly need reforming, but this is almost certainly the wrong reform to impose.

At the same time the government wishes to calculate the inflation by CPI rather than RPI, this was recently ruled illegal for private pensions.

I don't like it when teachers strike (having gone to school in the 1980s when teachers striked for two days a week for odd lessons, and children were expected to find their own food on the streets unless they were on free-diners - when they were given a hamburger and chips, and told to eat it in the playground), but I can understand why they feel the need for a single day of strike action based on how they are being treated.