new circuits onto an AMD3 board with RCBO's - ref 18th ed?

[whittledr]

Hi,
I am planning a house extension and will need to add 3 more circuits to my existing board. My current set-up is a metal CU with all circuits on RCBO's. Will I be able to add circuits to this board under 18th Ed or will i need a board swap to make room for all the extra surplus surge protection and afdd stuff?

 

[loz2754]

I resisted at first. But with the price drop, I now just include the SPD in the quote for every consumer unit change. It makes sense.