These changes to Part V will introduce flexibility into the system which will give local authorities a variety of choices in deciding how social and affordable housing requirements of their communities are to be met. They are firmly within the principles of Part V – to integrate housing supply fully into the planning system and require applicants for permission on residentially zoned land to contribute towards meeting the existing need for social and affordable housing. The system in Britain requires developers to make up to 30% of larger developments available as social or affordable housing. The aim of their policy is also to achieve mixed communities with a balance of housing types and tenures. The difference is that, through their more flexible system, they are delivering low cost and social housing. It has become a normal and accepted part of the planning process for developers to negotiate with local authorities on social and affordable housing provision and build those houses, either as part of the development or at another location.