London Underground and two rail contractors have been fined £100,000 each after a tube maintenance wagon was allowed to run out of control.
The wagon reached speeds of up to 30 miles per hour as it travelled through seven stations on the Northern Line in August 2010.
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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.