Lord Clyde: My Lords, it is an elementary rule in the interpretation and the application of statutory provisions that it is to the words of the legislation that attention must primarily be directed. Generally it will be the ordinary meaning of the words which will require to be adopted. On appropriate occasions it may be proper as matter of interpretation to adopt extended meanings to words or phrases, particularly if thereby the purpose of the legislation can be best effected or the validity of the legislation preserved. On other occasions it may be appropriate to adopt a strict or narrow meaning of the language used. But whatever the intensity of the process the temptation of substituting other expressions for the words of the statute in the course of interpreting it is to be discouraged, however attractive such a course may seem to be by way of explaining what it is thought the legislature is endeavouring to say. It may certainly be useful to analyse a statutory provision so as to identify the successive elements of which it is composed and so focus attention on the particular word or words which call for interpretation, or isolate the particular requirements which have to be met for its application… But such an exercise should not involve any significant departure from the actual language which has been used.