OH hell! I'm so sorry! They must be in the wrong Union!
Aside; I can't see very well please accept apologies for typos.
But I don't quite understand, when you say 'the union' because there are several Teachers' Unions. Are all the Staff in the same one?
You need to join a tough Union that will really support you. One that regards Teachers as Professionals and fights to have them treated respectfully. After seeing all the soppy stuff that most Teachers' Unions did, and watching a Headmistress slap a child and a Deputy Head say 'there's nothing we can do', I joined NASWUT. They won't have you if you say you've been in the NUT. Contrary to what I secretly feared, they were brilliant! The Rep was a gentleman. As it turned out I did not need any support because the Inspectorate were immensely pleased when I reported the Head Teacher.
Also you should welcome the Ofsted. Don't sound 'moany' just be frank. Be honest. Tell them your work load. Have written evidence. Don't hide a thing. Let them know how you have meetings all the time, have the timetable written out, for each week, let them see how you lose your PPAs, how the Vice Principal simply puts pressure on people, expects extra work like the 80 hours of marking above your normal work in December and the 120 hours expected in February. Tell them he expects three times forty-hour-weeks of work fitted in above the work load you are already doing!
When I had it revealed to me that I was greatly being taken advantage of, to the extent of abuse, I joined a Union with teeth. Even if you don't like everything about them, you need one that is really behind you. It was not the NUT.
Don't listen to Teachers who just moan and wimp. Many like being Martyrs. Too many just moan all the time but never actually try to put things right, To me that's not good enough. It's the children who suffer in fact.
Decide, are you going to get ill and be ground to a pulp in this system? Or are you going to stick up for yourself, point out the completely unworkable work load this Vice Principal is expecting, and try and make things work better for you and the Pupils? If no good comes of it, well, you are well qualified, you can go anywhere you like or do Tuition. But I think you will make a difference. I really do. I think the Staff are just worn out and thinking of leaving. Instead think of the children and try to make a healthier environment for them.
See this as a fight for better education for the children, you said ' the other geography teacher is an unqualified teacher from abroad. They couldn’t find anyone else so gave him a chance. However, they don’t want to train him up to gcse level. He is only teaching ks3.'.... Really?? This is the only other member of your department? Is this a real school? The poor children! I had such good Teachers and my Geographer Teachers were so brilliant. I'll never take my education for granted... I never did, but... the poor kids in your school! Ofsted have to help.
You are still new enough to stand up to this Vice Principal (pal btw) and let him see that his ideas are not going to scare you. Remember, without you he does not have a Geography department. See what colour he turns when you mention that you will be leaving now, if you are forced to do this February marking.
Your health comes first.