Regulation 9 Providing unique access codes
—The Registrar General must provide a unique access code—
(a)
to every household and communal establishment on the address register in advance of census day, or as soon as possible thereafter,
(b)
to every elector, when requested,
(c)
with every H4, CE4 and I4 paper questionnaire,
(d)
to any prescribed person who requests it, and
(e)
to replace a unique access code already provided.