I strongly believe places should be offered to children attending Calderdale primary schools first.
There are legal rulings which apply
Greenwich Judgement (1989)
This judgement established that maintained schools may not give priority to children for the sole reason that they live within the LA’s administrative boundaries.
Rotherham Judgement (1997)
This established that admission authorities may operate specified catchment areas as part of their oversubscription criteria provided that, in doing so, they are not in breach of the Greenwich judgement.
So there are methods like catchment areas which can be used, so long as it does not contravene the Greenwich Judgement.