The film's plot sounds too shocking to be true, but it's actually based on real events.
A report said the pandemic, a housing crisis and health challenges contributed to safeguarding pressures.
Thousands of Londoners are facing a difficult commute on Wednesday morning as a signalling fault has affected the Elizabeth line and Heathrow Express. National Rail has warned trains between London Paddington and Heathrow Terminal 5 may be delayed or cancelled. Transport for London also warned there were severe delays between Hayes & Harlington and Heathrow Terminals on the Elizabeth line while it fixes a signal failure at Heathrow Terminals 2&3.