Replacing wired smoke alarms

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I currently have two out of date wired alarms - BRK 370MX is showing as the model number.

I’ve bought two aico alarms to replace them from Screwfix.

I’ve taken off the old alarm and and removed the plug which goes into the back of the alarm. I can’t seem to remove the plug though that the wires are connected to.

There doesn’t seem an obvious way to remove the plug. Can I just cut the wires and strip them for the new alarm?

There’s a brown, blue and white. I assume the white is the interconnect?

Thanks in advance.
 
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The old alarm has a block which the wires are currently going into. I’ve unplugged this block from the old alarm.

But the new alarm just has a standard terminal block for bare wires to go into - like a plug or other electrical appliance.

How do I get the block off so I can wire in the new alarm?
 
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First two pics are of the old alarm fitting and the block/plug that fits to the old alarm.

Third pic is of the new alarm fitting.

cheers.
 

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Pull the wires down , that plug on block will have a set of connectors on the end
 
Ahhh.

So I’ve pulled them down and have this terminal block.

I assume I can detach the plug end from this terminal block and just wire all the relevant wires to the new alarm. So no need to cut the plug end off?

Cheers.
 

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