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3.—(1) The registrar must nominate one or more addresses to be default addresses for the purposes of these Regulations (which need not meet the service address requirements).
(2) The registrar may only nominate an address under paragraph (1) if the address is—
(a)one at which the registrar carries out functions, or
(b)a PO box.
(3) The registrar must perform the duty in paragraph (1) by means of registrar’s rules(1).
See section 1117 of the 2006 Act.