Smoke detector types

With any luck a current EI (Aico) unit may fit. But if not, change the plate as you have the cable there.

However, personally, I always fit interlinked smoke detectors to the bedrooms too as there's no guarantee smoke from a bedroom will get to the hall through a well fitting door.

EI also do a nice range of lithium 10 year radio interlinked alarms if adding wiring is a problem.

I thought for properties available for let they had to be mains powered units?

I am sure Ei-Aico used to claim the 10 year radio were an accepted alternative for Class D (mains) alarms. But now I can find no trace on their new website.

There's no class for "full life battery powered" (most alarms only have a service life of 10 years). Common sense would say the Ei 600 series

Would I be happy with them - yes - especially if it meant being able to fit alarms in places mains doesn't go.

Would they pass legislative requirements for rental properties in England? Pass. Still trying to figure that out.

If in doubt, ring Ei-Aico - they are very helpful by all accounts.

Not for single dwellings in England. (HMOs are different as the landlord has to make it "fit" and interlinked alarms are generally needed.)

Yes in Scotland.

Not for Wales and NI unless BRs require it.

I fitted some in our village hall a couple of years ago - it hasn't burned down yet.

Correction: Tim Watts post prompts me to realise I got Scotland wrong: for single dwellings at least in Scotland they need to be interlinked, but long-life battery are OK. (I think: I ain't diving into the regs again.)

And it would be the optical version.