Hi folks,
I took a break to update myself and :-
a) I've aquired the Galaxy 2 install manual which
b) informs me that a complete power down of the system restores the defaults such as the default engineer code ######
c)The manual also indicates that the tamper alarm can be stopped using the user code so plan is now
d)Leave mains power on, remove cover (zapping tamper noise with user code), zap 12v battery connection, remove mains power fuze, whilst holding pillow over internal sounder until my 'jobbing' electrician gets the battery out if it sounds. External is dummy.
e)remove phone line
f) hopefully this will leave a default system readily accessible by anyone with the manual.
No doubt there will be cries that it won't work but that was never my style.
I'll report on events later.