4Subject to the next following paragraph, the said grounds, in relation to any work specified in a notice under paragraph 2 of this Schedule, are the following, that is to say,—
(a)that the work could not reasonably be regarded as work falling within paragraph (b) of subsection (1) of section twenty-two of this Act;
(b)that the work is likely to be ineffective, or is by its nature unsuitable to the land in question, or is proposed to be carried out in an unsuitable way;
(c)that the estimated cost of the work is grossly disproportionate to any prospective increase attributable to the work in the value of the land;
(d)that the work, in a case where the former use of the land in question was agricultural, would not be appropriate to the use of that land for agriculture, or, in any other case, would not be appropriate to the use of that land for its former use;
(e)that the work would not be required but for dilapidation, deterioration or damage which has occurred since the end of the period of occupation and is attributable to default on the part of the owner or of an occupier of the land;
(f)that the work, if carried out at the time specified in the applicant's notice, would be premature;
(g)that the work, if carried out at the time specified in the applicant's notice, would not have been carried out at the first reasonable opportunity after the end of the period of occupation, or within a reasonable time after that opportunity arose.