Ex blocking change of school

Please help!

I have two daughters and have been awarded resident parent, by the courts, and for very good reason.

My ex has residential contact 2/3 days per week and it seems, have equal PRR.

In short, I have now moved in with my partner who lives 10 miles away from my daughters’
school. It’s a lot of travelling and I want to move my girls to the local school, where we live and where their step-sister also goes. It’s a much better school, and I want to prepare them for going to the local high school, make local friends and just settle into their new home better.

My ex won’t agree so will need to raise a court action to request this.

He lives across the road from the girls’ school* and is now also threatening to overturn the residence on the basis of a ‘change of circumstances''.

Where are his chances of blocking the school move and also overturning the residency of this basis?

Oh, I should mention he lives in the aforementioned house - across from the school - due to an engineered situation. It is the ex-martial home, which he previously agreed to sell. But while I was preparing to move out, packing up etc - he sneakily moved himself in during the night while I was away and is staying put as it is ‘his right’ to live in the marital home – despite the fact I have paid totally for its upkeep for 3 years. This is another court action!