Accordingly, such canons of construction as that words in a non technical statute will primarily be interpreted according to their ordinary meaning . . " According to Lord Simon looking into the legislative history or ' the preparatory works may sometimes be useful but may often lead to abuse and waste, as "an individual legislator may indicate his assent on an assumption that the legislation means so and so and the courts may have no way of knowing how far his assumption is shared by his col leagues, even those present." "In the absence of such mate rial it is said, the courts have five principal avenues of approach to the ascertainment of the legislative intention: (1) examination of the social background, as specifically proved if not within common knowledge, in order to identify the social or juristic defect which is likely subject of remedy; (2) a conspectus of the entire relevant body of the law for the same purpose; (3) particular regard to the long title of the statute to be interpreted (and where available, the preamble), in which the general legislative objectives will be stated; (4) scrutiny of the actual words to be interpreted, in the light of the established canons of interpretation; and (5) examination of the other provisions of the statute in question (or of other statutes in pari materia) for the illumination which they 148 throw on the particular words which are the subject of interpretation.