I'd expect anyone who considers their family to be middle class to ensure their middle class children are educated alongside other middle class children. Particularly so if their children are not robust enough to deal with the poors, and/or believe themselves, via their parents' teachings/attitude, to be naturally superior to the poors.
Surely when middle class parents are unable to secure middle class education for their middle class children, they can no longer self-define as middle class? In reality, they are merely "upper class" poors, exercising delusions of being middle class.
What I have learned from this site is middle class people who overextend themselves financially to keep up with their middle class neighbours frequently look to their own middle class parents to pay for the education of their middle class grandchildren.
Perhaps that's the solution in this case? Beg or bully the middle class grandparents into stumping up the necessary fees?
One caution, though, ensure you calculate the amount of cash you're bullying/begging from the middle class grandparents includes enough to cover the VAT just in case when Labour return to power. 👍