It is for renting the property yes as otherwise nothing needs doing I was told. To be honest, I understand everything that has been said so far the problem I am getting is no electrician is willing to change the RCBOs and pass EICR and these are coming from Checkatrade and mybuilder websites. Same stories, its plastic, no SPD so it won't pass EICR. In fact only the front lid is plastic, the casing is metal but even then I have not been able to find anyone to do this. I did have another person come in today to have a look and he gave a very different view. He said he would put in additional one RCD breaker in one of the spare blanks in the middle of the MCU to protect the 4 MCBs on the left and that should be fine so not sure what to make of this one. Could this work instead of the RCBO option?