One of London's specialist mental health cars helps to ease pressure on the service from the growing number of patients in crisis, including a homeless university student living rough.

As London sleeps. crews battle to care for vulnerable, lonely and critically ill patients, including an elderly man who has suffered catastrophic trauma after a fall downstairs.

Aer a frantic 999 caller reports witnessing a relative being attacked by an XL bully dog, crews are dispatched – but the dangerous dog is still on the loose.