The total of the left hand circuits exceeds the 80A rating of the rcd…. Unlikely to happen, but someone having a shower, just as the cooker is heating up, and a few high rated appliances…
I don’t expect a 40 year old rcd to trip at all unless it’s been tested frequently.
Changing to an all RCBO board is less nuisance if there’s a trip. A light bulb goes in a plug in table lamp, and you lose everything…
Is there anything else that suggests the property needs an EICR? New purchase? Rental property? Dodgy DIY?
It might be false economy to get the EICR done first, just to be told you definitely need a new board…. Changing the board includes much of the same testing.
If you decide beforehand you want a new board, there will be a test certificate to cover that anyway.
And just to make you aware, you don’t have to use the same electrician that did the EICR to do the remedials. And also a decent EICR, should take 3 to 4 hours. If they’re in and out in 45 minutes, it’s not been done correctly.