This is LFC's DH posting.
craigslittleangel, in answer to your question about how additional lessons for exams will run given the current work-to-rule, they will go ahead as usual.
The NASUWT work-to-rule action does not cover voluntary extra work done by teachers. Voluntary extra work, for example running a school sports club, is specifically mentioned as not covered and teachers are free to continue voluntarily doing this work without breaking the work-to-rule.
Additional lessons before exams are voluntary. As are additional lessons that run throughout the school year for pupils who are falling behind. And additional lessons for pupils to catch up when they have been absent due to school sporrts events, illness, family holiday etc. So teachers can continue to run all of these.
For example, next week I will be teaching an additional lesson after school for a target group of students who are borderline pass/fail, to prepare them for exams. On another day I will also be covering a voluntary session usually run by a colleague in my department because he will be taking some other students to an inter-school debating competition. I'll also then stay to teach a lesson to some of the students in the debate team because they have to miss the final lesson of the afternoon to travel to the competition and their teacher for that lesson isn't able to stay late enough that day to help them catch up. The next day I'll also be giving up one of my PPA sessions to teach a small group of borderline pass/fail students, withdrawing them from their normal lesson to give them more individual support just before the exam. So 4 hours of voluntary extra teaching next week (including time to plan those lessons and mark the pupils' work). This is on top of my normal weekly workload (see t0lk's post above for a rough idea of what that is).
And before all the anti-teacher posters comment, yes of course if this is all voluntary I could just not do it. However, as experienced teachers we have performance-related pay targets to meet and without all this voluntary work we'd never hit them or make pay progression. So I choose to do it, because I care about the kids, want them to pass and I need the money. It's my choice and I am in no way complaining about it. But what we do complain about is a completely incompetent government with no idea what goes on in schools (Gove came to my school and was less-informed about education than any other visitor we've ever had) introducing bureaucratic reforms that increase central-government meddling in the choices of young people, increase paperwork and workload, introduce a myriad of pointless changes to procedure that we then need to do paperwork to fall into line with that won't help young people at all, refusing to honestly negotiate about pensions and refusing to listen to anyone in education advising them and instead respond to any criticism by using the press to paint us all as lazy, overpaid, selfish, incompetent and left wing.