Isolate mains to old panel, test this, do not assume. Mains electricity can kill.
Open old panel and label all the cables you see, so Zone 1 for instance its power cores and its tamper cores. Do so for all zones.
Identify the bell cable and its core functions.
Identify the internal sounder cable and its core functions.
At this time the external bells will be ringing if all is well, get a ladder and if safe remove bell triggers and standby battery.
Fit new panel and rebuild it with the marked cables.
Power up and close lids.
Rebuild external bell.
Now program the system, all should be well assuming the cables and existing peripherals are in good working order.
Well done, job finished.
As for installers in Glasgow, either check with neighbours for a good local company or use the SSAIB or NACOSS websites for local approved companies.
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