A businessman has died after being pushed under a moving lorry as he chased a gang trying to raid his shop. Shammi Atwal confronted the men who entered his Barking cash and carry - armed with metal bars.
Detectives have praised the 45-year-old's bravery, and a murder investigation has been launched.
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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.