" 40. Deprivation of citizenship … (2) The Secretary of State may by order deprive a person of a citizenship status if the Secretary of State is satisfied that deprivation is conducive to the public good. … (5) Before making an order under this section in respect of a person the Secretary of State must give the person written notice specifying— (a) that the Secretary of State has decided to make an order, (b) the reasons for the order, and (c) the person's right of appeal under section 40A(1) or undersection 2B of the Special Immigration Appeals Commission Act 1997 . … 40A. Deprivation of citizenship: appeal (1) A person who is given notice under section 40(5) of a decision to make an order in respect of him under section 40 may appeal against the decision to the First-tier Tribunal. (2) Subsection (1) shall not apply to a decision if the Secretary of State certifies that it was taken wholly or partly in reliance on information which in his opinion should not be made public— (a) in the interests of national security, (b) in the interests of the relationship between the United Kingdom and another country, or (c) otherwise in the public interest. … 41. Regulations and Orders in Council (1) The Secretary of State may by regulations make provision generally for carrying into effect the purposes of this Act, and in particular provision— (e) for the giving of any notice required or authorised to be given to any person under this Act…"
"A person may appeal to the Special Immigration Appeals Commission against a decision to make an order undersection 40 of the British Nationality Act 1981 (deprivation of citizenship) if he is not entitled to appeal under section 40A(1) of that Act because of a certificate under section 40A(2)..."
"(1) Where it is proposed to make an order under section 40 of the Act depriving a person of a citizenship status, the notice required by section 40(5) of the Act to be given to that person may be given— (a) in a case where that person's whereabouts are known, by causing the notice to be delivered to him personally or by sending it to him by post; (b) in a case where that person's whereabouts are not known, by sending it by post in a letter addressed to him at his last known address. (2) If a notice required by section 40(5) of the Act is given to a person appearing to the Secretary of State or, as appropriate, the Governor or Lieutenant-Governor to represent the person to whom notice under section 40(5) is intended to be given, it shall be deemed to have been given to that person. (3) A notice required to be given by section 40(5) of the Act shall, unless the contrary is proved, be deemed to have been given— (a) where the notice is sent by post from and to a place within the United Kingdom, on the second day after it was sent; (b) where the notice is sent by post from or to a place outside the United Kingdom, on the twenty-eighth day after it was sent, and (c) in any other case on the day on which the notice was delivered."
"(1) Where it is proposed to make an order under section 40 of the Act depriving a person of a citizenship status, the notice required by section 40(5) of the Act to be given to the person may be— (a) given to the person by hand; (b) sent by fax; (c) sent by email; (d) sent by courier; (e) sent by document exchange; (f) sent by post, whether or not delivery or receipt is recorded; or (g) sent by any of the means set out at (b) to (f) to— (i) the person's representative; or (ii) if the person is under 18, their parent or guardian. (2) Where the notice is sent under paragraph (1)(b), it must be sent to a number provided by the person or the person's representative. (3) Where the notice is sent under any one or more of paragraphs (1)(c) to (g), it must be sent— (a) to the address for correspondence provided by the person or the person's representative; or (b) where no such address has been provided, the person's last known address or the address of their representative. (4) Where— (a) the person's whereabouts are not known; and (b) either— (i) no address has been provided for correspondence and the Secretary of State does not know of any address which the person has used in the past; or (ii) the address provided to the Secretary of State is defective, false or no longer in use by the person; and (c) no representative appears to be acting for the person or the address provided in respect of that representative is defective, false or no longer used by the representative, the notice shall be deemed to have been given when the Secretary of State enters a record of the above circumstances and places the notice or a copy of it on the person's file. (5) A notice required to be given by section 40(5) of the Act is, unless the contrary is proved, deemed to have been given— (a) where the notice is sent by fax, when it is sent; (b) where the notice is sent by email, when it is sent; (c) where the notice is sent by document exchange, on the day after the day on which it is sent; (d) where the notice is sent by post from and to a place within the United Kingdom, on the second day after the day on which it is sent; (e) where the notice is sent by post from or to a place outside the United Kingdom, on the twenty-eighth day after the day on which it is sent; (f) where the notice is sent by post where delivery or receipt is recorded, when the notice is recorded as having been delivered or received; (g) in any other case on the day on which the notice is delivered."
"The regulations may, in particular, make provision about cases in which notice is to be deemed to have been given."
"The provisions show that the decision of which the Secretary of State is required to give notice is given effect by the order, and that the order and notice are not, in substance, distinct decisions. Whether or not the order is made as soon as possible after the decision is notified, the reasons for the decision and for the order are and must be the same. The making of the order does not require a distinct process of reasoning, nor does the legislative scheme permit that."