That is complete nonsense those RCBOs will directly fit that consumer unit. The fact your consumer unit is metal is not Coded in the Report from what I can see, it was a comment.
Just to update, I have now had two different electricans come in for another opinion. Both said that RCBO's would not fit or work with my main consumer unit. One of them said its because my MCU is plastic and not metal. You can't fit RCBO's in plastic main consumer units, only complete metal ones he said. The other electrican just said you can't fit RCBOs in this unit. Both said it would not pass EICR unless I change to new unit. Both recommended BG (British General) MCU.
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