I am torn here. It is easy to see it as protesting about a change in hours, but that change in hours will have a huge impact on people with children in school. It is also about the security of the grey book, and how they have proposed to implement the changes. S. Yorks FA have basically said "accept this change in conditions or be sacked"
On the flip side: In this financial climate, where many people have lost their jobs/houses, many skilled people are working for minimum wage, many people are struggling to get by, a firefighter refusing to perform his/her function because they want to change the hours, will seem to many to be a little out of line, to say the least.
FWIW, from discussions held with punters, the publics perception of this strike seems to be quite negative, compared to when they were fighting to be paid an amount reasonable to their responsibilities/risks.
In my opinion it is caused by a lack of communication, with persons in upper management (Maybe even the CFO) purely looking at production/efficiency measures without considering the impact on their staff. Fair enough the night shift is relatively unproductive and modernisation is an unstoppable force, but IMO they have met their unmoveable object in the FBU defending the Grey Book conditions of service.
We will have much greater problems to deal with once Mr Brown's bail-out of the banks starts to hit public spending.