If you find someone who has collapsed and is unresponsive, follow these steps:
Check for danger. Make sure it is safe to approach.
Check for a response. Tap their shoulders and shout "Are you alright?"
Call for help. Shout for someone nearby to help you.
Open the airway. Tilt the head back gently and lift the chin.
Check for normal breathing. Look, listen, and feel for no more than 10 seconds. Occasional gasps are not normal breathing.
Call 999 immediately \u2014 or ask someone else to call while you start CPR. Tell the dispatcher the person is not breathing. They will guide you through CPR.
Send someone for the nearest AED. Ask a bystander to find one \u2014 the 999 dispatcher can give the location of the nearest registered device.
Start CPR. Place both hands on the centre of the chest and push down hard and fast \u2014 5\u20136cm deep at 100\u2013120 compressions per minute. Do not stop until the ambulance arrives or an AED is ready.
Use the AED as soon as it arrives. Switch it on and follow the spoken instructions.
If there are other people with you, one person should do CPR while another calls 999 and a third goes for the AED. Do not leave the person alone if you can help it.