violethill:So what do you do in a situation where employing two part time equivalents to a full time post is going to cost you more?
tethersend: My point is that the question shouldn't be addressed to the teacher- it should be addressed to the school/borough/LEA/Government.
Only just got back to the thread, but actually tethersend, I agree with you on this point. The question shouldn't be addressed to the teacher concerned, because there should already be a clear policy in place to cover situations like this. So certainly the OP should not be getting last minute phone calls from her Head, asking her to come in, when the pay situation isn't clarified.
However, I think there is a huge difference between part time posts which are instigated by the school, because they need a teacher on a P/T basis only, and part time posts or job shares which are instigated by the employee because they want to work part time.
Where I work, the vast majority of part timers were originally appointed to a full time post. They went on ML leave later, and requested to come back, say, 3 days a week, so in most of these case, another part timer has to fill the gap.
One of the condtions of an employer agreeing to such requests, is that it doesn;t place an additional burden of cost on the employer. So, for example, if two job sharers said they wanted to be paid for a two hour crossover per week to liaise, the answer would be no, not because the school is being difficult or awkward, but because that liaison should be done in the employees' own time. If that involves paying for childcare etc, then that's part of the deal of accepting a part time role. TBH in this situation, I think parents evenings and INSET fall into the same category. The school budget should not be used to pay someone to come in on a day 'off', if that person is doing part of a job which could be done more cheaply by one person. It's just not right to divert money which should be used for other purposes. Even if school budgets were healthier (I wish!) then the principle remains the same.
Of course, if a school wants someone to teach part time, and advertises that, because there isn't a full time need, then that's different. I think in that scenario,it's entirely reasonable that the employee should be paid for anything over that part time contract. But again, that situation should be made clear in the first place - it shouldn't have to be discussed every time a situation arises.