Practical advice needed on house with no earth/ground
RCDs. Done.

An RCD detects ground faults, which includes "electrical shocks to humans". 

In Europe, there are several types of RCD in general use - whole house and individual-circuit.  RCDs which protect humans should trip at around 8 milliamps, give or take.  RCDs designed to protect the house (not the humans) are rated higher, at 35 milliamps give or take.  This means a ground fault in that range (8-35 milliamps) would nonetheless continue to shock the human, could stun the human, and in rare instances can kill - especially if the stun causes secondary effects (drowning or falling). 

Grounds have several purposes, but the raison d'être was to try to solve the electrocution problem. Grounds provide an auxiliary path back to source, to help the ground fault flow enough current to trip the breaker.  If that seems like a round-about way to solve the problem, you are right, but that was all they had at the time. 

RCDs are arguably a better way to solve that problem, since they more directly act on any ground fault, even one too small to cause an over-current trip of the breaker.  Grounds have their usefulness, but I wouldn't lose any sleep in an ungrounded house with good RCD protection.