1930s Burgot Gramaphone Burglar Alarm

Very rare and interesting Gramaphone burglar alarm with built in phone made by Burgot alarms ltd.When the trip wire is triggered it plays a pre recorded Gramaphone record and dials 999 on the built in phone.Circa late 1930s this would have been used during Ww2 when crime was far more prevalent.An interesting piece of history.It is in working order with it’s original charging handle.It has its original box also.Thanks