4SBefore exercising—
(a)a right under section 12 of this Act above to carry out safeguarding works to a building;
(b)a right under paragraph 2 above to enter a building;
(c)a right under paragraph 3(a) above to enter a building or land; or
(d)a right under paragraph 3(b) above to enter land,
the authorised undertaker shall, except in the case of emergency, serve on the owners and occupiers of the building or land not less than 14 days' notice of its intention to exercise that right; and in a case falling within sub-paragraph (a) or (c) above the notice shall also specify the safeguarding works proposed to be carried out.