Step one:

You should always stop at the scene if you think your accident has caused injuries to people or domesticated animals, damage to vehicles or roadside fixtures

Step two:

Do you need the emergency services?
Call 999 immediately if any of the people involved are in need of urgent medical attention; (ask for an ambulance) the road is blocked or damaged; (ask for the police) someone leaves the scene without exchanging details; (ask for the police)

Step three:

Are there any witnesses? Try and get the names, addresses and vehicle registrations of any witnesses.

Step four:

All drivers involved in the accident must exchange details. Try to obtain the name, address, telephone number, vehicle registration, insurance company and policy number of the other drivers involved. You should also provide this information about yourself. You could offer a form of identification as a gesture of goodwill.

Step five:

Try to make a sketch at the scene of the accident and remember to include as many details as you can. Make notes of street names, vehicle locations and directions of travel, skid marks, collision points etc. Many people carry a camera in their car. When taking photos at the accident scene, be careful near busy roads.

Step six:

If you feel there are other details worth recording make a note at the scene. For example, if one of the drivers was using a mobile phone.

first aid tips:

Get help

If bystanders are present, get them to phone for an ambulance at once. Otherwise, check on casualties first.
Life threatening or serious injuries must be treated swiftly.

Airways

Tilting the casualty's head back and lifting the chin will 'open their airway'.

Breathing

Ensure all casualties are breathing and have the ability to carry on breathing. If a casualty is not breathing, apply artificial ventilation by blowing your expelled air into the casualty's lungs.

Circulation

If the heart has stopped (no pulse) chest compressions' can be applied (preferably by a qualified first aider) to force blood through the heart and around the body. They must be combined with artificial ventilation so that the blood is oxygenated (use 15 compressions to two breaths ratio). That will keep the body receptive to defibrillation when the emergency service arrives.

Bleeding

Control bleeding by applying direct pressure and, where possible, elevating injured body parts.

Burns

Cool burns by pouring cold water over them for a minimum of 20 minutes or until the casualty no longer complains of pain.

Broken bones

Advise the casualty to sit or lie still, keeping the injured part supported by a blanket or pillow until help arrives.

Accurate info

When you dial 999, the control officer needs to know the exact location, type and seriousness of the accident; the number, sex and approximate age of casualties involved and anything you know about their condition, details of any hazards and whether any casualties are trapped.

Treat shock

Anyone hurt in an accident is likely to suffer some degree of shock. Talk to the casualty gently and lay him/her down if necessary. Blood loss and shock display the same symptoms.

Provide warmth

Protect the casualty from cold with a coat or blanket.