"The question arising on this appeal concerns the exercise by the court of its power to set aside a statutory demand "on other grounds" within sub-paragraph (d). In my view, the right approach to paragraph (4) of rule 6.5 is this. Under the Act, a statutory demand which is not complied with founds the consequence that the debtor is regarded as being unable to pay the debt in question or, if the debt is not immediately payable, as having no reasonable prospect of being able to pay the debt when it becomes due. That consequence, in turn, founds the ability of the creditor to present a bankruptcy petition because, under section 268(1), in the absence of an unsatisfied return to execution or other process, a debtor's inability to pay the debt in question is established if, but only if, the appropriate statutory demand has been served and not complied with. When therefore the rules provide, as does rule 6.5(4)(d), for the court to have a residual discretion to set aside a statutory demand, the circumstances which normally will be required before a court can be satisfied that the demand "ought" to be set aside, are circumstances which would make it unjust for the statutory demand to give rise to those consequences in the particular case. The court's intervention is called for to prevent that injustice. This approach to sub-paragraph (d) is in line with the particular grounds specified in sub-paragraphs (a) to (c) of rule 6.5(4). Normally it would be unjust that an individual should be regarded as unable to pay a debt if the debt is disputed on substantial grounds: sub-paragraph (b). Likewise, if the debtor has a counterclaim, set-off or cross demand which equals or exceeds the amount of the debt: sub-paragraph (a).