Just to round this one off.....
I opened up the alarm case to discover that the battery was a 2.1Ah Yuasa and duly sent off for a replacement from e-bay. The new one turned out to be 2.3Ah, but I was assured (I believe, correctly) that this one would be even better than the 2.1!
Of course I tried my methodical best to do the changeover this afternoon but, as feared, I managed to set the alarm bell going. Keying in our code didn't seem to make any difference and I suspect that somehow we had lost the memory/code when the mains electricity was shut off and the battery was being removed. Maybe we should have left the mains supply on during the operation??? [Can anyone confirm this?]
We keyed in various combinations of digits that the engineer had scribbled on the instruction (ha, ha) sheet and managed to quieten the beast down, stop the flashing lights and revert to the basic factory code. Tomorrow, after I've built up sufficient courage, I'll try and change it back to our preferred code.
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Changing a burglar-alarm battery? new
Changing a burglar-alarm battery? new