70.—A person who, but for section 4 of the Landlord and Tenant (Ground Rents) (No. 2) Act, 1978, or section 16 (2) (d) or 16 (2) (e) of that Act, would be entitled to acquire the fee simple of a dwelling-house shall, notwithstanding those provisions, be entitled to acquire that fee simple save where—

(a) in a case to which section 4 of that Act applies—the appropriate State authority, or

(b) in a case to which section 16 (2) (d) or 16 (2) (e) of that Act applies—the Minister for Transport,

is satisfied that such acquisition would not be in the public interest and so certifies.