(1) Subject to paragraph (3), in relation to an application for an improvement grant where one or more of the following conditions are satisfied:—
(a) on the date on which the application is approved the premises in respect of which it is made are in a housing action area;
(b) the application is in respect of a dwelling which is or forms part of, or is to be provided by the conversion of, a house in relation to which the local housing authority have served a notice under section 189 or 264 of the Housing Act 1985 and the relevant works consist of or include works which if executed would contribute towards rendering the house fit for human habitation;
(c) the application is in respect of a dwelling which is or is to be provided by the conversion of a dwelling which is in need of works of repair of a substantial and structural character, and the relevant works consist of or include such works;
(d) the application is in respect of the provision or improvement of a dwelling for a disabled occupant and the relevant works consist of or include works needed to meet a requirement arising from a particular disability from which he suffers,
the appropriate percentage is 75 per cent.
(2) Subject to paragraph (3), in relation to an application for an improvement grant to which paragraph (1) does not apply, the appropriate percentage is 50 per cent. or, where the premises in respect of which the application is made are in a general improvement area, 65 per cent.
(3) In relation to an application for an improvement grant, where it appears to the local housing authority that the applicant would not without undue hardship be able to finance so much of the cost of the relevant works as is not met by the grant—
(a) if apart from this paragraph the appropriate percentage would be 75 per cent., it shall instead be 90 per cent.; and
(b) if apart from this paragraph the appropriate percentage would be 50 per cent., it shall instead be 65 per cent.