The deputy PM is to announce new rules to boost affordable homes as a £20bn shortfall in UK public finances is revealed

• Angela Rayner: Labour’s radical housing plan will be smart, tailored and strategic

A sweeping overhaul of planning rules to trigger the building of many more affordable homes will be announced by the government this week as it confronts the economic and social legacy of 14 years of Conservative rule.

Deputy prime minister Angela Rayner will unveil a new National Planning Policy Framework to MPs on Tuesday before they depart for the summer recess in a move that will strengthen requirements for far higher numbers of affordable homes to be built in areas of need, starting this autumn.