Losing pp when you know that you can get it again is an incentive to develop but not a big enough one.
Perhaps I should have expanded on my point. The definition of development is so loose that a developer can effectively cast a single foundation and that secures the planning permission in perpetuity because the development is deemed to have begun. So whilst it's possible for a planning permission to expire, any half-savy developer will circumvent it.
Perhaps I should have expanded on my point. The definition of development is so loose that a developer can effectively cast a single foundation and that secures the planning permission in perpetuity because the development is deemed to have begun. So whilst it's possible for a planning permission to expire, any half-savy developer will circumvent it.