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Thanks for the prompt responses and hopefully you can see the image below if I've followed scripting correctly. Otherwise there's not much detail on the device: BS842 Voltage Operated Earth Leakage Circuit Breaker, 60 Amp, 200/250v 50 Hz Type D. Made by the now defunct / merged...

Inline with the incomer switch in my house, installed by the previous owner, is an RCD/ELCB that states it is BS842:1965 ELCB 60 Amp Type D. I can't find this BS Spec (without paying) so to continue the question on RCD types, does anyone know what defines a "Type D"? Partial information I have...