Writing in The Guardian (Society, p6), Mr Perry says that top of the agenda for Hilary Armstrong, the housing minister, is the desire to get to grips with the chaotic pattern of rents.
The contradications are currently enormous. For example, a tenant in a three-bedroom housing association property in Southampton will pay£24 more per week than the equivalent council tenant.
But, says Mr Perry, there is no simple formula for changing the system. Whatever system chosen, there will be winners and losers. For councils, the changes could be cushioned by the subsidy system.