After fitting an RCD, test it quarterly.
> Another item to perhaps fit is a mains smoke detector, since it's all to easy
> to have a battery flat/removed - and rewireable fuses indicates older wiring.
yeah, mains smoke alarm is another option I guess (although that is probably just as easy to branch of the lighting circuit I imagine?). The wiring is perhaps 35 years old as it was rewired when my parents moved in - it is all grey pvc now.