A senior counter-terrorism detective with the Met Police has been charged with breaching the Official Secrets Act.
Detective Chief Inspector April Casburn is also accused of offering information to the now-defunct News of the World newspaper.
She appeared in court and our reporter Paul Brand was there.
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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.