Section 126 of the Building Act 1984 (BA 1984) is the general interpretation section of BA 1984. In it, ‘statutory undertakers’ is defined as: ‘…persons authorised by an enactment or statutory order to construct, work or carry on a railway, canal, inland navigation, dock, harbour, tramway, or other public undertaking; but does not include a universal service provider (within the meaning of Part 3 of the Postal Services Act 2011) or a relevant company (within the meaning of Part 4 of the Postal Services Act 2000).’ The definition appears a few times in BA 1984, but of principal note is BA 1984, s 4, which provides that: ‘…nothing in this Part of this Act with respect to building regulations,