DS2 has two main TAs that split his hours, with one taking a majority of hours, the other takes 3 afternoons a week so his main TA can do prep work and such. It works really well this way. DS2 is in reception right now, but is moving into year one in September.
We were just advised this week that both his main TAs will be moving up with him into year one. Their hours are adjusting slightly (second TA will be with him 2 afternoons a week instead of 3, so main TA is taking that afternoon), but other than that, he will have the same support in place. It was a big relief to us, and thankfully the senco at the school insisted that it was vital for a smooth transition into year one. We were happy to note that one of his teachers from this year (reception teachers job shared) is going to be his teacher part time (again, job sharing) in year one as well!
I have no idea how the school has it contracted, as his statement has just gone through within the past few weeks, however the school has been providing full time 1:1 throughout the entire school year regardless. I'll admit that when we mentioned to the headteacher that we wanted his main TA to continue with him into year one (TA was happy to do so), the headteacher was fairly non-committal, I suspect due to issues of staffing and not wanting to commit to something she couldn't guarantee. However, the senco immediately stepped in and insisted that it was important, so it was ironed out pretty quickly.
Have you spoken to the senco or the TA? I know the person that was one of DS2's main TAs previously had to stop because she had to change her hours for personal reasons. It was a shame, as she worked very well with him, but it happens. Perhaps they are trying to smooth it over because that TA is no longer available to work with him for some unrelated reason and don't want you to take offence? I know that our school has a specific group of TAs that have worked with DS2, so that one of them can step in if need be (illness, etc). So I can see where they might not want them completely reliant on just one TA. But yes, it's important for them to build up a good rapport and have things be consistent as well.
I will point out that I absolutely love the job-sharing of the TAs for DS2, as it means he is not thrown completely off by someone new in case of illness or holidays or schedule changes. It gives them both time off from him (he rather active
), and it gives them time to prepare things for him ahead of time (visual aids if needed and accessing lessons to see what support he might need ahead of time).