Just to echo Carbonara and savester's comments:
It's a long time since local authorities decided how much to spend on education. This is a central government decision. The government claims that funding is increasing but it's not increasing as fast as inflation or as fast as the number of pupils is rising so income per pupil is falling drastically -
Mainstream schools have to make £3.0 billion in efficiency savings by 2019-20 against a background of growing pupil numbers and a real-terms reduction in funding per pupil. The Department is looking to schools to finance high standards by making savings and operating more efficiently but has not yet completed its work to help schools secure crucial procurement and workforce savings. Based on our experience in other parts of government, this approach involves significant risks that need to be actively managed. Schools could make the desirable efficiencies that the Department judges feasible or could make spending choices that put educational outcomes at risk. The Department, therefore, needs effective oversight arrangements that give early warning of problems, and it needs to be ready to intervene quickly where problems do arise.
Amyas Morse, head of the National Audit Office, 14 December 2016 [www.nao.org.uk
At the same time costs are rising, and funding for schools in London is being redistributed to other areas which have historically been underfunded.
There is no doubt that funding for schools is going to be reduced significantly.
The thing is that back office functions are a tiny fraction of costs at most schools, of course, if savings can be found they should be but staff costs make up around 80% of school spending so it is inevitable that there will be staff cuts to balance the books.
The class size limit of 30 pupils only applies in reception and KS1 so schools might increase class sizes at KS2 to reduce costs.
There is no statutory requirement to have a TA in every class so schools could reduce the TA headcount significantly
The breadth of the curriculum, enrichment activities, subsidies for school journeys etc. for families that can't afford the full cost are all at risk.
Some schools have already started to ask parents to pay to subsidise their child's education.
If none of that seems like a problem to you then fine, but if you think that those sorts of changes would have a material and negative impact on your child's education then please don't just sit and hope it doesn't happen - please do try to stop it - [www.fairfundingforallschools.org