Absolutely, you've provided essential advice for handling a boiler emergency. If you encounter a boiler emergency, it's crucial to take immediate action to ensure your safety and the safety of others in the property. Here's a step-by-step guide on what to do in case of a boiler emergency:

1. **Turn Off the Gas Supply:** If you suspect a gas leak or any other issue related to the gas supply, the first priority is to turn off the gas supply to the boiler. Locate the gas isolation valve, which is usually located near the boiler or on the gas supply line. Turn the valve to the "off" position to stop the flow of gas.

2. **Ventilate the Area:** If you suspect a gas leak or carbon monoxide (CO) leak, open doors and windows to allow fresh air to enter the property and ventilate the affected area. This will help disperse any dangerous gases and reduce the risk of exposure.

3. **Evacuate if Necessary:** If you suspect a emergency boiler repair severe gas leak or CO leak and notice symptoms of carbon monoxide poisoning (such as headaches, dizziness, nausea, or confusion), evacuate the property immediately. Go outside and seek fresh air. If anyone is experiencing severe symptoms, call emergency services right away.

4. **Do Not Use Ignition Sources:** Do not operate any electrical switches, appliances, or ignition sources if you suspect a gas leak, as this could cause a fire or explosion.

5. **Contact a Professional:** After taking the necessary safety precautions, contact a qualified heating engineer or technician immediately. Explain the nature of the emergency and follow their advice. If there is a gas leak or immediate danger, also contact the appropriate emergency service (e.g., gas emergency service or fire department).

6. **Install a Carbon Monoxide Alarm:** To help prevent carbon monoxide poisoning, install a carbon monoxide alarm near the boiler and sleeping areas. Regularly check and maintain the alarm to ensure it functions properly.

7. **Do Not Attempt Repairs:** In a boiler emergency, do not attempt to repair the boiler yourself, especially if it involves gas-related issues. Leave the repairs to qualified professionals who have the expertise and equipment to handle the situation safely.

Remember, boiler emergencies can be hazardous and require immediate attention. Taking swift action to turn off the gas supply, ventilate the area, and seek professional help is crucial to ensuring the safety of everyone involved. Regular boiler maintenance and servicing can also help prevent emergencies by identifying and addressing potential issues before they escalate.