Let me give some of the self employed sparks here a business lesson. No one will ever pull you up for making something safer. It is a good opportunity to upgrade DB, makes install safer and is work for OP. Tony you should know better, how hypocritical of you, you state in previous threads that you worked for a multi national company, I guarantee they would have sold any product / service they could push, required or not, for the best margin possible, and you were a cog in that machine. Also imagine this conversation:
OP: Doctor, I can't sleep for worrying
Doctor: What is your worry?
OP: I may of added 30ma RCD protection to a clients house.
Doctor: Is that bad
OP: No, it makes it safer
Doctor: GET OUT!!
lol......