Around 52,000 properties sold through Right to Buy in London are now let by private landlords. The figures have been released by Labour London Assembly member Tom Copley, and make up 36% of properties sold.
Read more: How the Right to Buy scheme works
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.