AIBU to say no to this at work?

She's not being used as a TA though. She's just supervising them like she does in the playground with the children who play outside. Just because these children have SEN it doesn't mean their break times aren't break times just because they're indoors.

Every school I’ve worked in has trained 1-1s on a staggered lunch so they can supervise appropriately

The pay difference would certainly explain this; bring in a new (cheaper) midday supervisor, get you to act as a TA and save money - in fact my only surprise is that more aren't doing the same

As PPs have said, contact your union immediately before doing anything, but I'd certainly want to stop this spreading

But you aren't working with with these children during their learning time so what is there to train for? Or be paid more for?

Supervising children is supervising children whether it’s in the playground or the library or wherever.

Often children that have 1-1 support in lessons are not funded to have that support during break times because it has been decided that their needs can be met within the usual school provision.

I don’t think it comes across very well that you’re happy to supervise NT children but when asked to supervise children with SEN, you want to refuse.

Once you say yes the responsibility will be thrown on to you. Taking responsibility means taking the blame when an incident occurs. You are not trained for this nor paid for it. And the backlash maybe guilt tripping you or being cross from the delegates of the task. Stand firm and ignore backlash and excuses.

You are being used as a TA without the training or back up. That’s not the job you applied for. They’re taking advantage as long as you don’t say anything. Are the hourly rates different?

If it's not in your job description I'd be asking them when this temporary arrangement is due to finish as you want to return to the post you signed up to.

Why can't they train the new woman up properly and she can do the 1-2-1 ?

A bit harshly put but sadly true. An old contract I had from school ended with “and anything else the head of the school wants you to do” 😳. My advice would be a request to move back to your previous area. If you don’t get this I would look for another job. OR do what some staff did that I worked with; make a really rubbish job of it and they’ll take you out of there. 😁

How many children are you being asked to supervise at the same time? I think it is only fair to say to the school that if they want you to do this then they need to give you some focussed ( and time paid for) training on how to manage the children , deal with their particular needs etc. I understand that their 1-1 people need a break, but it is not right to do this on the cheap by expecting you to do it on your own.

What does it say in your contract? See your union.

You don’t need any qualifications to supervise children.

This is the reality of working in a school. The class you are used to aren’t your class, they are just the class you usually work with but now the school needs you elsewhere. Or do you think that you’re employed to do what you want instead of what the school and its children actually need?

The trained TAs and 1-1’s will be having their lunch while you are supervising, that’s why you’re there.

This does not sound fair on anyone. These pupils with additional needs should have support plans. Have you been given access to these so you know how best to support them? Also, the support ratios sound wrong - you cannot be expected to be 1:1 support as well as other pupils.

It would depend on the wording in your job description I think. Go back and have a look at that. Are you in a union? That could be your next step.

you are not being unreasonable. Sounds to me like the teaching assistants or the other carers for these children fancy having a relaxed lunch and someone has had an idea to draft you in. On one hand you should take this as a compliment as they must trust you and the children must like you.
on the other hand if anything happened while you are with these children then you’d be getting the blame (or perhaps even if they accidentally get injured or injure you)
i think you need to say you are ready to return to your contractual duties.

YANBU and this is concerning

YANBU, you should absolutely stand up for yourself

Definitely stand your ground. This doesn’t seem at all appropriate (ex teacher).