We are all feeling the pinch and everyone is having to work till a later retirement age. So it's only fair that everyone does the same.
But the change in contributions and how much pension you will receive when you retire make a huge difference.
We had the same issue in my company. They wanted to change the pension scheme so that we paid more and they paid less and then ended up with a smaller pension when we retired. Our unions organised a strike which forced management into negociations and we got a slightly better deal out of it.
So I would say it's worth striking for that reason.
But as for pay/pension, teachers are not the worst off in the country.
Think about all the childcare workers. They work normal hours (8-5 or 9-6 usually), have to deal with screaming kids and babies, mess, nappies and obnoxious parents but get paid only £15,000 even if they are qualified to degree level. There's no pension scheme and they have no union representing them.
These are the people that look after the country's kids enabling parents to go to work and earn money. If they didn't work, a huge number of parents would have to stay at home and look after their own kids.