and as far as modern alarms are concerned,i remember they had a shop in sauchiehall st in glasgow,they used to sell what they laughingly called recondition bell boxes,(they nicked em of old shops)and they sold a white box with a triac encapsulated as an alarm panel,
yes a great company,i can still see it,you remove the lid and what do you see?a little epoxy box with leads going to a terminal block,i used to make them up for kids to play with,and if mem serves,they charged £25.for it,how times have changed,most alarm equipment now is made in china,taiwan,egypt even israel,at least they work!!!
gts, June 2011