Since the 1970s, non-profit housing associations have been operating an increasing share of social housing properties in the United Kingdom. From 1996 they have also been known as Registered Social Landlords (RSLs), and public housing has been referred to as "social housing" to encompass both councils and RSLs. Despite being non-profit based, RSLs generally charge higher rents than councils. However, the Westminster Government introduced a "rent re-structuring" policy for housing associations in England in 2002, which aimed to bring council and RSL rents into line in England by 2012. Local planning departments may require private-sector developers to offer "affordable housing" as a condition of planning permission (section 106 agreement). This accounts for another £700m of Government funding each year for tenants in part of the United Kingdom. As of 2012, Housing Associations are now also referred to as "Private Registered Providers of Social Housing" (PRPs).