For the purposes of a claim under section 19 or 20 or 21, this Act applies, unless the context otherwise requires, as if—
(a) every reference in it to a dwellinghouse included a reference to the multi-unit complex or stand-alone complex concerned; and
(b) every reference in it to the owner of a dwellinghouse included a reference to the representative of the owners of the dwellinghouses in the multi-unit complex or stand-alone complex concerned; and
(c) every reference in it to a party or parties included a reference to the representative of the owners of the dwellinghouses in the multi-unit complex or stand-alone complex concerned.