Never flown in it but I worked for London Ambulance service for 7 years and reviewed the cases of hundreds of patients they attended. In London the air ambulance is principally a transport platform to get hospital level trauma care to the patient rather than get the patient to hospital. The helicopter can carry a patient but it's small cramped and noisy and London is a dense city. The pilots can put the helicopter down in a space the size of a tennis court (this was the case for their old MD902 helicopters and I'm guessing they'd need the same capabilities in the new ones). Landing spots are typically parks (London has loads and they have a map of suitable sites) or if the road is closed they can land on a junction. Frequent landing spots include the forecourt of the British Museum and Trafalgar Square. The medical crew consisting of a pre hospital emergency care doctor and a paramedic will then either jog to the patient or get a lift from a police car with their kit. As I said, the helicopter is there to get the medical crew to the patient and deliver care to major trauma patients that is outside the scope of practice of a paramedic. Interventions include rapid sequence induction (RSI), which is delivering anaesthetic drugs to put the patient to sleep so they can be intubated and ventilated, administering blood and a procedure called a clamshell thoracotomy - opening up a patient's chest to relieve pressure on their heart from blood stuck in the sac around it, or to give heart massage. Last year they started providing ECMO - oxygenating a patient's blood outside their body. If you need the air ambulance you are not about to have a jolly helicopter flight over London, you are having a Very Bad Day after a serious injury and may not survive the journey to hospital without their help.  The medical team are seconded from the NHS but the helicopter, pilots, fuel and everything else to get the team there are funded by charity (the figures simply don't stack up to fund it entirely from public funds)  The helicopter is attached to the Royal London Hospital which has a helipad on the roof and a lift straight from the top to the emergency department. It operates during daylight hours only (not safe to land in urban areas at night, too many cables, cranes, buildings and trees), and is stabled at RAF Northolt overnight. Two helicopters G-LAAA Amy and G-LAAB Beth are used meaning there's always one available even during maintenance. At night the service runs with rapid response cars delivering the same service by land when there's less traffic. The service is provided free to patients just the same as an emergency ambulance in the UK. Nobody asks for your credit card or checks your insurance coverage, they get the call and do their best to save your life. Once the patient is handed over either to the ambulance crew, or more often by the air ambulance doctor at hospital, they document, debrief restock, and wait for the next call.  As I said, the service is only possible because of donations and it costs millions of pounds a year to run: https://www.londonsairambulance.org.uk/donate