Location of CO Detector

BUFF

shiraz99 said:

BUFF said:

"What the alarms must have
If you use battery alarms, they must be sealed tamper-proof units and have long-life lithium batteries, which can be up to 10 years. "

https://www.gov.scot/publications/fire-and-smoke-alarms-in-scottish-homes/

This is one reason that Nest battery-powered smoke alarms don't comply in Scotland as they have replaceable batteries.
(they also can't be heat only so don't comply for  use in a kitchen in Scotland.).

You're referring to smoke alarms not CO detectors.

"If the carbon monoxide alarm is battery operated, it must have a sealed battery for the duration of its lifespan, which may be up to 10 years."
https://www.mygov.scot/home-fire-safety

The Nest Protect is both a smoke & CO detector. The battery version is not compliant for either role under current Scottish legislation.