Rover alarm when battery refitted

I have a Rover 820i manual. I have just charged up the car battery and attempted to refit it, but as soon as I put the key in the ignition the alarm goes off. Oddly, when I put the battery back just a few weeks ago this did not happen. I have never used the remote/immobiliser fob. Any suggestions?

TIA, Pash

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Pash
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