Correct!

What's the first thing you must do if you have a collision while you're driving your car?

Stop only if someone waves at you
Call the emergency services
Stop at the scene of the incident
Correct answer
Call your insurance company

DVSA theory test explanation

If you're in a collision that causes damage or injury to any other person, vehicle, animal or property, by law you must stop. Give your name, the vehicle owner's name and address, and the vehicle's registration number to anyone who has reasonable grounds for requesting them.