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So, then, what does the neutral at 'A' correspond to? Incoming supply or an outgoing C40 or C32a MCB?

The fibres make a 'popping' sound when the land on the hot electronic parts (PCB) in an LED downlight.

Looking at the picture, I'm a bit unsure of the neutral configuration 'A' corresponding to the first and the second circuit breakers on the left: is there a neutral missing?

I had to use the 'Paint' program to resize and to reduce the kB size of the image.

I would consider a door that's hinged (like a PDL DBF30) is easily accessible, as opposed to a switchboard that has a metallic door (more so a commercial switchboard) that is lockable or accessible using a tool.