[pjc50]

This is an under-rated risk of the (existing) natural gas system that I think people often ignore.

https://cks.nice.org.uk/topics/carbon-monoxide-poisoning/bac... :

"It is estimated that there are approximately 4000 attendances at accident and emergency departments in England each year for treatment of carbon monoxide poisoning.

There are approximately 440 hospital admissions per year in England due to carbon monoxide poisoning.

Approximately 51% of these admissions are due to accidental exposure, and 40% are due to intentional self-harm (undetermined in the remaining 9%).

In England and Wales, approximately 40 deaths are reported each year due to carbon monoxide poisoning."