A petition against plans to close Lewisham's Accident and Emergency Department is to be handed to Downing Street. More than 20,000 local people, consultants, GPs and MPs have signed it.
The planned closure is part of a reorganisation of the South London Healthcare Trust, which has been put into administration.
More top news
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.