The FCU is a double pole switch which isolates both the live and neutral.
With that lighting blue neutral wired into the socket the neutral cannot be isolated. This is not dangerous as such, but very misleading for anyone working on the lighting.
It is likely that the lighting wiring should have a lower fuse.
Have you got a picture of the cabinet light wiring are there any transformers to them?
The feed from the SFCU has been botched and there could be issues with cable sizing and equipment further downstream linking to the lights.
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