Not sure if this is the exact wording:
Single-core cables armoured with steel wire or steel tape shall not be used for an a.c. circuit. The conductors of an a.c. circuit installed in a ferromagnetic enclosure shall be arranged so that all line conductors and the neutral conductor, if any, and the appropriate protective conductor are contained in the same enclosure.
Where such conductors enter a ferrous enclosure, they shall be arranged such that the conductors are only collectively surrounded by ferrous material.
It's not actually a Cafe, it's an Ice Cream Parlour.