Nick Clegg will say that the shortage of homes for young people has created a "generational shift" in the debate, with people becoming more receptive to the idea of new developments which in the past would have been strongly resisted.
The babyboomers of the fifties and sixties, people who were largely catered for by the massive housing expansion after the Second World War, are now watching their children struggle.
The plight of the next generation is making what was an abstract housing shortage increasingly tangible and real. And as we, as a society, become more open to development that creates the space for politicians to be bold.
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Mixed fortunes across the UK tomorrow. Still breezy across the north.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
MPs and Lords have been left unable to access their emails remotely as a result of the attack.