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Had you asked for the shed to be supplied from the EV board before he started?
It looks like NYY-J as it's got a slight wave to it, it's generally fine to use in domestic environments.
I generally use RCBO's on everything. They are not very expensive so unless there's an operational constraint (like selectivity is important) I can't see how not having it would be acceptable from a risk, cost, effort perspective.
It's true that armoured cables don't need rcd protection but potentially the cable hasn't been installed to requirements like the depth or with tape. An rcd would further limit risk.
Did you ask for no rcd for the EV too?
OP states that sub board circuits are all protected by rcbo. Assuming ads is met on distribution circuit, it would be reasonable enough to ask that it not be rcd protected.
I agree that the cable cleated below appears to be tuff sheath, but took it to be EV charge point supply. Perhaps the OP could clarify which it is.
I seem to have missed the latest image, despite responding to the post in which it was added. Lack of rcd protection on both circuits raises more questions.