Latest police figures estimate that more than 20,000 marched today to protest against the closure of the Accident and Emergency unit and the downgrading of the maternity unit at Lewisham Hospital. Liz Wickham was there too.
More top news
Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.