If you decide to move away from your current estate, but wish to retain an option to return, then you would need to notify the Housing Regeneration Team.
Tenants remaining on an estate would have priority for new choice of homes. When an estate has been mostly built and all the tenants remaining on the estate have been re-housed, then the Housing Regeneration Team would contact those who have retained an option to return to ask if they now wished to exercise that option and return to the estate. Anyone responding to that offer would be provided information on what homes are available and how they can bid for those new homes.
Only after all those who wish to take up the option to return have moved back to the estate would new homes be made available to those on the general waiting list.