Since you’re wondering... it’s the house we’re buying, and last time I was round I forgot to look, and didn’t want to bother the current owners with the query. It’s not a case of knowing so I can decide whether to buy the house or not, it’s more a case of wanting to identify it so I can look into bringing it up to modern standards, either by replacing mcb’s by rcbo’s or by replacing the whole unit.
I don't know if it is an optical illusion (camera angle etc.), but the example photo that flameport posted looked to me as if it probably had less than an ideal amount of 'headroom' for installing RCBOs, particularly if the earth bar and neutral bars are at the top.
The thing is replacing a CU is notifiable. That means if you care about being legal you have to involve either an electrican or building control which either way means a bunch of extra hassle and expense.
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