Sure. I know that's how it's supposed to work. But it doesn't. The local councils change every few years or they don't have the staff or resources to compete with the developers and force them to uphold the masterplan.A lot of this comes from a local planning level though and not a national government level. If a developer is looking to build new houses that will put a significant strain on the existing infrastructure then they are expected to contribute financially to improve the infrastructure. For example make a contribution to a school - whether it's building a new school or contributing to an extension/improvements to an existing school to increase capacity. Where I am it's a set amount per pupil based on the amount of new pupils they think the housing development will generate. The planning guidance is set nationally but down to local authorities to ensure it is implemented.
So Rachel will need to provide all the town councils with a ton of funding so they've got the resources to make sure everything comes together then.