I have successfully completed a long court case (took 2 years) of a child relocation case.
Mother moved my son about 300 miles away from me, and I thought it would be useful to quote case law and other material that was used to successful relocate my child back within 5 miles of me!
It can be done, but is expensive and takes time. You also need a good barrister who understands case law rather than a pure LIP, use the direct access barrister website to find one or private message me for suggestions.
Useful case law used in my case:
Re C (Internal Relocation)  EWCA Civ 1305,  Fam 253