The Secretary of State may pay contributions to a local housing authority towards such expenditure incurred by them under the provisions of this Part relating to general improvement areas as he may determine.
In the case of any expenditure, the contribution—
The aggregate of the expenditure towards which such contributions may be made with respect to a general improvement area shall not exceed the sum arrived at by multiplying—
but two adjoining general improvement areas may for this purpose be treated as one.
The Secretary of State may, with the consent of the Treasury—
An order under subsection (4)(a)—
For the purposes of this section—
In the case of contributions payable in respect of—
subsection (2)(b) above has effect with the substitution of "75 per cent." for "one-half".