(1) A company may change the address of its registered office by giving notice to the registrar.
(1A) The notice must include a statement that the new address is an appropriate address within the meaning given by section 86(2).
(2) The change takes effect upon the notice being registered by the registrar, but until the end of the period of 14 days beginning with the date on which it is registered a person may validly serve any document on the company at the address previously registered.
(3) For the purposes of any duty of a company -
(a) to keep available for inspection at its registered office any register, index or other document, or
(b) to mention the address of its registered office in any document,
a company that has given notice to the registrar of a change in the address of its registered office may act on the change as from such date, not more than 14 days after the notice is given, as it may determine.
(4) Where a company unavoidably ceases to perform at its registered office
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