Mains interlinked smoke alarms - recommendations?

1 Sep 2008
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United Kingdom
I have interlinked mains-powered Kidde Fyrnetics alarms throughout my house - 8 smoke, 1 heat and 1 CO.

As a few are getting a bit yellow now (yay brominated plastic) I looked at replacing those ones but can't get a straight answer on compatibility with newer models. As the system is 13 years old (with a 10 year life) I'm considering replacing the lot. The obvious answer is to replace with a new Kidde system as that fits the old patresses, but are there any other good brands these days? I have 3c+e cabling throughout so wireless isn't necessary.
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