I would say this is the ONLY instance where piggy backing of connections is acceptable. It is common around our area where there are two storey flats or apartments & additional feeds would clutter the face of the building. I know some councils are fussy with wiring clutter on any accommodation that is communal.
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You need to be careful to fully checkout the omnibox (wall box). My omnibox is shared with my next door neighbour, but there are two cables from the street box going into it and separate connections to each house. This seems to be a common occurrence in my area, originally Cable London, where each pair of semi-detached houses only has one street ‘T’.
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