sockets not on rcd

[growler]

I went to a house the other day where the lady had a new cooker installed with a new feed. The spark had done here a new board. I was just being nosy and noticed there was only 1 rcd and one of the rings was on the non rcd side. there were six circuits in total. Im trying to figure out why this has been done. the homeowner wasnt around to ask. My spark mate at work reckons maybe the rcd picked up a fault and the customer didnt wanna fork out for the time / hassle of finding it. so it wasnt put on rcd. is this acceptable? is it also acceptable to only use 1 rcd? Maybe once he found a fault he couldnt convert the board to split load and non rcd? thanks in advance!

 

[GLENNSPARK]

what i mean is...had he bothered to upgrade both the earthing and bonding before carrying out any work....such as this C/U change......