I've got recent experience of this since my DD is due to start school in September. Her proposed statement is for 32.5 hours and it stipulates that the school is to fund the first 12.5 hours and the LA will fund the other 20. This is in an LA where schools were previously expected only to fund the first 5 hours.
The HT of the school has told me that based on the budget they've seen for the forthcoming year they actually have less money overall, not more. I don't know if that's because the LA hasn't yet got their heads around the fact that they should be devolving more £ into the SEN pot or what.
But, based on what the HT has seen so far re next year's budget, they're planning to re-jig how they use LSAs in the rest of the school in order to ensure that they can have someone assigned to my DD all the time. This is a single form entry village school in an area that has lost out on the deprivation/high incidence of lower level SEN parts of the schools funding formula.
I've definitely been given the impression that the school has not been given extra funding into its SEN pot this year although, as I say, it could be the LA just hasn't got its act together yet.
I have thought as I've been going through the process of choosing a school that if my DD wasn't my younger child and we were going into schools cold without the benefit of having a sibling already at the school, then we'd have found it far more difficult to get her accepted willingly into a MS setting.
Arguably, if my DD is taking existing LSA time away from other children then her presence in that school could be seen as detrimental to the education of other children in the school and I worry that this is an argument that some schools may try to pull in the future.
Ljc there's definitely the option in the new funding arrangements for schools to apply for top-up funding from the LA if they have more high-needs children on their role - not sure of the criteria though. Good luck with your move.